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2024年7月1日 · 放到一个连续映射H: [0,1] x M \to N 的两端。. 既 H (0,M)=f (M)，H (1,M)=g (M)。. 那么就称f于g是同伦等价的。. 当然这个集合上有一个显然的群结构：p * q=h。. 既h定义为h (0)=q (0)，h (1/2)=q (1)=p (0)，h (1)=p (1)。. 显然可以证明集合 \pi_1 (X,x)是一个群：\pi_1 (X,x)。. 也显然可以 ...
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Stories of People who went to different dimensions and back. There really do seem to be interdimensional warps
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