An Introduction to Homological Algebra
《An Introduction to Homological Algebra》 · 第 17 页 · Definition 1.4.4
Two chain maps \(f,g:C\to D\) are chain homotopic if their difference \(f-g\) is null homotopic.
An Introduction to Homological Algebra
《An Introduction to Homological Algebra》 · 第 17 页 · Definition 1.4.4
Two chain maps \(f,g:C\to D\) are chain homotopic if their difference \(f-g\) is null homotopic.
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