Algebraic Topology
《Algebraic Topology》 · 第 28 页 · Section 2.1
A map \(f:X\to Y\) is null homotopic if it is homotopic to a constant map.
Algebraic Topology
《Algebraic Topology》 · 第 28 页 · Section 2.1
A map \(f:X\to Y\) is null homotopic if it is homotopic to a constant map.
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