Happy 2pi Day!

2pi = 6.283185307179586476925286766559...

2pi shows up in many places in math and science:

* The formula C = 2pi r
* Converting between fractions of a revolution and radians
* Converting between frequency and angular frequency
* Fourier transforms
* Any physics involving waves
* The formula for the complex roots of unity
* The Gaussian distribution
* Stirling's approximation

Historical accident has given us a symbol for 3.14...,
but the number twice as large has a much better claim
to a place among the most important mathematical constants.

--
Jim E. Black (domain in headers)
How to filter out stupid arguments in 40tude Dialog:
!markread,ignore From "Name" +"<email address>"
[X] Watch/Ignore works on subthreads
.

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