A Preadditive Syntax for Chain Complexes: From Sketch Models to Homology Functors
Super-Preadditive Sketches and the Koszul Tensor Product
Bicartesian squares (both pull-back and push-out) and Short exact sequences
kernel as left adjoint and cokernel as right adjoint
From the 9 Lemma to the Five Lemma
The Monoidal Structure of Ch(R): Total Complexes, Tensor Ideals, and Internal Homs
The Architecture Behind the Hom Differential I: Bifunctors and Totalization
The Architecture Behind the Hom Differential II: Tensor-Hom and DG Enrichment
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