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[" 10.Let "f:X rarr Y" be an invertible ...

[" 10.Let "f:X rarr Y" be an invertible function.Show that "f" has unique inverse."],[" (Hint: suppose "g_(1)" and "g_(2)" are two inverses of "f" .Then for all "y in Y" ,"],[" fog "_(1)(y)=1_(Y)(y)=f_(0)g_(2)(y)" .Use one-one ness of "f" ) "],[" 11.Consider "f_(0)" ."f" ."]

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