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feat: Heterogeneous behavioural equivalences #460

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Merged
fmontesi merged 8 commits into from
Mar 30, 2026
+476 −421
Merged

feat: Heterogeneous behavioural equivalences #460

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17081ca
Heterogeneous behavioural equivalences
fmontesi Mar 27, 2026
a215448
switch to subscripts
fmontesi Mar 29, 2026
eeeaf26
fix names
fmontesi Mar 29, 2026
6af4c57
fix hml test
fmontesi Mar 29, 2026
f3c9e62
fix other tests
fmontesi Mar 29, 2026
74b61fa
fix namespace issue
fmontesi Mar 29, 2026
a13e611
unused args escape
fmontesi Mar 29, 2026
5f26b99
fix unused args incantation
fmontesi Mar 29, 2026
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4 changes: 4 additions & 0 deletions Cslib/Foundations/Data/Relation.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,10 @@ theorem WellFounded.iff_transGen : WellFounded (Relation.TransGen r) ↔ WellFou

namespace Relation

/-- The empty (heterogeneous) relation, which always returns `False`. -/
@[nolint unusedArguments]
def emptyHRelation {α : Sort u} {β : Sort v} (_ : α) (_ : β) := False

attribute [scoped grind] ReflGen TransGen ReflTransGen EqvGen CompRel

theorem ReflGen.to_eqvGen (h : ReflGen r a b) : EqvGen r a b := by
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