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並前往https://www.sas.upenn.edu/~htowsner/uconnprev/math202f16/midterm2sols.pdf

Let f : A → B be an injective function with A non-empty. Prove ...

is always a function g : B → A so that f ◦ g = idB (where idB : B → B is the function. idB(b) = b)?. A disproof: suppose f is injective but not surjective, ...

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