[Merged by Bors] - feat(algebra/order/positive): new file #14833
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urkud
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Define various algebraic structures on the set of positive numbers.
I have two reasons to introduce these classes:
- we can use `{x : ℝ // 0 < x}` in various filter bases; this may save us from explicit usage of `half_pos` or `div_pos` here or there;
- I want to introduce a multiplicative action of `{x : ℝ // 0 < x}` on the upper half plane.
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Define various algebraic structures on the set of positive numbers.
I have two reasons to introduce these classes:
{x : ℝ // 0 < x}in various filter bases; this may save us from explicit usage ofhalf_posordiv_poshere or there;{x : ℝ // 0 < x}on the upper half plane.