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the problem with modularity is that it becomes really difficult to suss out the useful libraries. so @thomasfuchs built micro.js, a directory to help folks find small tools to solve various aspects of client-side development. i checked it out and found a templating library called "tweet-templ"...
... a router in 139 bytes. of course it doesn't do the heavy lifting of sammy.js by fixing back-button issues and other problems, but it handles pattern matching and and 404s all within a tweet.
Between Events P and Q, the proper time is measured in the frame where the time-like vector from P to Q is stationary, thus Δt' in the frame S' is the proper time. And the proper time is shorter than any other time, like Δt measured in the frame S where the time-like vector from P to Q is seen as moving at speed v = 0.5c.
This is the picture where the red horizontal axis is spatial and the red vertical axis is time for the coordinates of the S frame.