An Introduction to Homological Algebra
《An Introduction to Homological Algebra》 · 第 17 页 · Definition 1.4.3
A chain map \(f:C\to D\) is null homotopic if there are maps \(s_n:C_n\to D_{n+1}\) such that \(f=ds+sd\).
An Introduction to Homological Algebra
《An Introduction to Homological Algebra》 · 第 17 页 · Definition 1.4.3
A chain map \(f:C\to D\) is null homotopic if there are maps \(s_n:C_n\to D_{n+1}\) such that \(f=ds+sd\).
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