[ruby-core:102039] [Ruby master Feature#17496] Add constant Math::TAU

Issue #17496 has been updated by universato (Yoshimine Sato).


FYI 

https://processing.org/reference/TAU.html
Processing may not be a general purpose language, but it has `TAU` and `TWO_PI` on its core.
Processing has `TAU` since 2013.

DOI: 10.14736/kyb-2016-6-0943
http://www.kybernetika.cz/content/2016/6/943
In this paper τ is used in the Gaussian density function.

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Feature #17496: Add constant Math::TAU
https://bugs.ruby-lang.org/issues/17496#change-89891

* Author: jzakiya (Jabari Zakiya)
* Status: Open
* Priority: Normal
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Excuse me if this has been brought up before.

This is a simple proposal to add the math constant ``Math::TAU`` = 2*``Math::PI``.

See: https://tauday.com/

``TAU`` has been included in a growing number of languages (Rust, Python3, Julia, et al), and this would add Ruby to that list, and make it even cooler. :-)



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