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[x in A,I(B)(x)=x," for all "x in B" are...

[x in A,I_(B)(x)=x," for all "x in B" are called identity functions on sets "A" and "B" ,respectively."],[" 18.Show that if "f:A rarr B" and "g:B rarr C" are one-one,then "gof:A rarr C" is also one-one."]

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