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chore(CategoryTheory): fix diamond for the preadditive structure on the opposite category#38281

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joelriou wants to merge 4 commits intoleanprover-community:masterfrom
joelriou:preadditive-op-fix
Open

chore(CategoryTheory): fix diamond for the preadditive structure on the opposite category#38281
joelriou wants to merge 4 commits intoleanprover-community:masterfrom
joelriou:preadditive-op-fix

Commits

Commits on Apr 20, 2026