refactor(init/algebra/order): remove decidable instances from linear_order #628
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gebner
reviewed
Oct 15, 2021
| (decidable_eq : decidable_eq α := @decidable_eq_of_decidable_le _ _ decidable_le) | ||
| (decidable_lt : decidable_rel ((<) : α → α → Prop) := | ||
| @decidable_lt_of_decidable_le _ _ decidable_le) | ||
| (max : α → α → α := @max_default α _ _) |
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I think we should still keep max in linear_order (or maybe add a has_sup class) so that you can override it with a more efficient (or defeq) version.
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@digama0 expressed some reservations about making this change on zulip: https://leanprover.zulipchat.com/#narrow/stream/113488-general/topic/move.20init.2Ealgebra.2Eorder.20from.20core.20to.20mathlib.3F I'll close this for now unless someone has strong opinions to the contrary. |
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I have not yet investigated what this does to mathlib!