Functor $\text{Ext}^{1}(A,-)$, equivalent interpretations (i) group of equivalence classes of short exact sequences, (2) measurement of non-exactnesss

score 89 · Answer 13 · 2026-04-11 19:24:24

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Reconstruction of commutative differential graded algebras

Published on 11 Apr 2026 - 19:24

score 181 · Answer 14 · 2026-05-11 05:06:45

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What is the most diagrammatic proof that $gf = 0 \implies \text{im } f \subset \ker g$?

Published on 11 May 2026 - 5:06

score 77 · Answer 15 · 2026-05-15 09:46:11

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Morita theory for presheaf (functor) categories

Published on 15 May 2026 - 9:46

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Functor $\text{Ext}^{1}(A,-)$, equivalent interpretations (i) group of equivalence classes of short exact sequences, (2) measurement of non-exactnesss

Reconstruction of commutative differential graded algebras

What is the most diagrammatic proof that $gf = 0 \implies \text{im } f \subset \ker g$?

Morita theory for presheaf (functor) categories

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