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Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
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EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
Download at
EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
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EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
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EFCO Fairley Font Collection includes 11 fonts that have different styles in sans, serif and script, which are all works great together or in their own. The script version also combined with ending swashes, use stylistic alternates from 0 to 9 to work with them. The Inspiration for this collection comes from today's graphic design trends. EFCO Fairley Font Collection was designed carefully to create dozens of font combinations and get really unique typographic for your project. It would be a perfect choice for posters, logos, t-shirt and magazine prints, eye-pleasing typographic designs and more.
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Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]
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Menger sponge
From Wikipedia, the free encyclopedia
An illustration of M4, the sponge after four iterations of the construction process
In mathematics, the Menger sponge (also known as the Menger cube, Menger universal curve, Sierpinski cube, or Sierpinski sponge)[1][2][3] is a fractal curve. It is a three-dimensional generalization of the one-dimensional Cantor set and two-dimensional Sierpinski carpet. It was first described by Karl Menger in 1926, in his studies of the concept of topological dimension.[4][5]
Construction
The construction of a Menger sponge can be described as follows:
Begin with a cube.
Divide every face of the cube into nine squares, like a Rubik's Cube. This sub-divides the cube into 27 smaller cubes.
Remove the smaller cube in the middle of each face, and remove the smaller cube in the center of the more giant cube, leaving 20 smaller cubes. This is a level-1 Menger sponge (resembling a void cube).
Repeat steps two and three for each of the remaining smaller cubes, and continue to iterate ad infinitum.
The second iteration gives a level-2 sponge, the third iteration gives a level-3 sponge, and so on. The Menger sponge itself is the limit of this process after an infinite number of iterations.
An illustration of the iterative construction of a Menger sponge up to M3, the third iteration
Properties
Hexagonal cross-section of a level-4 Menger sponge. (Part of a series of cuts perpendicular to the space diagonal.)
The n nth stage of the Menger sponge, M n M_{n}, is made up of 20 n {\displaystyle 20^{n}} smaller cubes, each with a side length of (1/3)n. The total volume of M n M_{n} is thus ( 20 27 ) n {\textstyle \left({\frac {20}{27}}\right)^{n}}. The total surface area of M n M_{n} is given by the expression 2 ( 20 / 9 ) n + 4 ( 8 / 9 ) n {\displaystyle 2(20/9)^{n}+4(8/9)^{n}}.[6][7] Therefore, the construction's volume approaches zero while its surface area increases without bound. Yet any chosen surface in the construction will be thoroughly punctured as the construction continues so that the limit is neither a solid nor a surface; it has a topological dimension of 1 and is accordingly identified as a curve.
Each face of the construction becomes a Sierpinski carpet, and the intersection of the sponge with any diagonal of the cube or any midline of the faces is a Cantor set. The cross-section of the sponge through its centroid and perpendicular to a space diagonal is a regular hexagon punctured with hexagrams arranged in six-fold symmetry.[8] The number of these hexagrams, in descending size, is given by a n = 9 a n − 1 − 12 a n − 2 {\displaystyle a_{n}=9a_{n-1}-12a_{n-2}}, with a 0 = 1 , a 1 = 6 {\displaystyle a_{0}=1,\ a_{1}=6}.[9]
The sponge's Hausdorff dimension is log 20/log 3 ≅ 2.727. The Lebesgue covering dimension of the Menger sponge is one, the same as any curve. Menger showed, in the 1926 construction, that the sponge is a universal curve, in that every curve is homeomorphic to a subset of the Menger sponge, where a curve means any compact metric space of Lebesgue covering dimension one; this includes trees and graphs with an arbitrary countable number of edges, vertices and closed loops, connected in arbitrary ways. Similarly, the Sierpinski carpet is a universal curve for all curves that can be drawn on the two-dimensional plane. The Menger sponge constructed in three dimensions extends this idea to graphs that are not planar and might be embedded in any number of dimensions.
The Menger sponge is a closed set; since it is also bounded, the Heine–Borel theorem implies that it is compact. It has Lebesgue measure 0. Because it contains continuous paths, it is an uncountable set.
Experiments also showed that cubes with a Menger sponge structure could dissipate shocks five times better for the same material than cubes without any pores.[10]