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[Phys-L] time constants and exponential decay



I just learned an interesting geometric way to think about those time
constants: from any starting point during the decay, the tangent line
always takes the same amount of time to reach the asymptote.

This may not be news, but I had never seen it before and it makes a nice
animation. I wrote it up here...

http://wp.me/p4uvY7-cR