feat(logic/indexed_eq): Indexed equality #10712
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YaelDillies
reviewed
Jul 19, 2022
src/logic/indexed_eq.lean
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| @[trans] lemma indeq.trans (h₁ : a =ᵢ b) (h₂ : b =ᵢ c) : a =ᵢ c := | ||
| indeq.rec_on h₂ h₁ | ||
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| lemma indeq_of_eq (h : a = a') : a =ᵢ a' := |
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How can Lean infer A in this lemma? I suspect it would be good making it explicit.
Co-authored-by: Yaël Dillies <yael.dillies@gmail.com>
semorrison
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the
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@eric-wieser What are your plans about this: discard? port to Lean 4? |
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Zulip thread.
I wonder if this would be more useful for working with graded monoid / rings than using sigma equality.