[ruby-core:101845] [Ruby master Feature#17496] Add constant Math::TAU

Issue #17496 has been updated by mrkn (Kenta Murata).


At least Julia doesn't have `tau` in its core now.  There is Tau.jl, but it isn't a standard library.  Following Julia's stance to `tau`, we can say that it is enough by providing a gem to define `Math::TAU` for now.

I'd like to know how to use tau in languages you listed up other than Julia, Python3, and C#.  Could you tell me the way?

jzakiya (Jabari Zakiya) wrote in #note-4:
> Well, Python3 added it, so when do you (empirically?, subjectively?) establish it's become time-proven?

I think we can add `TAU` in core if most mathematicians usually use tau as the circle constant in their academic papers.

I don't know how the situation of tau as the circle constant is changed from the time of the previous proposal.  I'd like to show my response to the previous pull-request again.

https://github.com/ruby/ruby/pull/644#issuecomment-123082639
> - It looks to me that tau as the circle constant isn't popular enough to be introduced in Ruby's core although it has good property.
> - So introducing tau is hurt the future Ruby now.  Core constants cannot remove easily.
> - It's not Ruby's role to help further the acceptance and adoption of tau.
> - I found that Python and Julia rejected similar proposals.  See https://bugs.python.org/issue12345 and https://github.com/JuliaLang/julia/pull/4864.

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?

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Feature #17496: Add constant Math::TAU
https://bugs.ruby-lang.org/issues/17496#change-89676

* 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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