.Let f be a function from X to Y.8 If X is first countable, which of the following conditions on fimplies that Y is firs
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.Let f be a function from X to Y.8 If X is first countable, which of the following conditions on fimplies that Y is firs
.Let f be a function from X to Y.8 If X is first countable, which of the following conditions on fimplies that Y is first countable * (1 نقطة) homeomorphism continuous, onto open o open, onto continuous, open
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