Theorem CategoryTheory.Abelian.Ext.ext_iff

Modification history

2024-07-31 09:27
Mathlib/Algebra/Homology/DerivedCategory/Ext.lean
chore: improve some ext_iff lemmas (#15340) …
Deleted CategoryTheory.Abelian.Ext.ext_iffView on Github →
2024-07-15 21:28
Mathlib/Algebra/Homology/DerivedCategory/Ext.lean
feat: the abelian group structure on Ext-groups in abelian categories (#14496) …
Added CategoryTheory.Abelian.Ext.ext_iffView on Github →