This PR upstreams lemmas about `Rat` from `Mathlib.Data.Rat.Defs` and
`Mathlib.Algebra.Order.Ring.Unbundled.Rat`, specifically enough to get
`Lean.Grind.Field Rat` and `Lean.Grind.OrderedRing Rat`. In addition to
the lemmas, instances for `Inv Rat`, `Pow Rat Nat` and `Pow Rat Int`
have been upstreamed.
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Co-authored-by: Kim Morrison <kim@tqft.net>
This PR upstreams the definition of Rat from Batteries, for use in our
planned interval arithmetic tactic.
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Co-authored-by: Sebastian Ullrich <sebasti@nullri.ch>
This PR introduces date and time functionality to the Lean 4 Std.
Breaking Changes:
- `Lean.Data.Rat` is now `Std.Internal.Rat` because it's used by the
DateTime library.
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Co-authored-by: Markus Himmel <markus@himmel-villmar.de>
Co-authored-by: Mac Malone <tydeu@hatpress.net>
