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>> No.15047265 [View]
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15047265

If i have a function f:A->B and B is a subset of C, how do i rigorously say f:A->C?
i was thinking ran(f) is a subset of B, B is a subset of C, so ran(f) is a subset of C.

now i'm not sure, maybe i can say f is a subset of AxC (since ran(f) is a subset of C), and then use that to say f:A->C?

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