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设 f, g 是双射。证明 (f \circ g)^(-1) = g^(-1) \circ f^(-1) 。(顺序颠倒 — "脱袜子先于脱鞋"。)
设 f, g 是双射。证明 (f \circ g)^(-1) = g^(-1) \circ f^(-1) 。(顺序颠倒 — "脱袜子先于脱鞋"。)
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