[ruby-core:101858] [Ruby master Feature#17496] Add constant Math::TAU

Issue #17496 has been updated by jzakiya (Jabari Zakiya).


To help answer this question,

> IMO, the sufficient condition is that it appears in some major textbooks for school.

and this,

> So, I want to know how many mathematicians accept such tau. Do you know how many academic papers that uses tau as the circle constant have been published so far?

I reviewed a couple of the ``TAU`` videos by Micheal Hartl, the author of ``The TAU Manifesto`` and creator of ``TAUDAY``. He provides examples of academic and educational resources where TAU is being used and formally taught. I have extracted some of that information here as examples to the answer to these questions.

``Textbook``
**College Trigonometry: With Extensive Use of the Tau Transcendental** (free downloadable version)
https://studyres.com/doc/17428279/college-trigonometry-with-extensive-use-of-the-tau-transc...

``Educational videos, and learning resources``
**Kahn Academy**
https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/long-live-tau/v/tau-versus-pi

https://www.khanacademy.org/math/trigonometry/unit-circle-trig-func/long-live-tau/v/pi-is-still-wrong

https://blog.khanacademy.org/happy-tau-day/

**Numberphile Video** 
https://youtu.be/83ofi_L6eAo

**Papers**
``PI is Wrong`` - https://www.math.utah.edu/~palais/pi.html

``The TAU Manifesto`` - https://tauday.com/tau-manifesto

You can find many more examples of ``TAU``'s use with more research|searching.

It has been 11 years now since 2010 when Michael Hartl wrote the ``The TAU Manifesto`` and started ``TAUDAY``.
It is gaining greater academic, educational, and scientific acceptance|use every year.
It is being included into more software languages and packages every year.

Hopefully, the totality of this growing body of work will establish ``TAU`` has met Matz's ``time-proven`` criteria.


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Feature #17496: Add constant Math::TAU
https://bugs.ruby-lang.org/issues/17496#change-89695

* Author: jzakiya (Jabari Zakiya)
* Status: Rejected
* 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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