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Let be a function from a st X to a set Y. Consider the following statements: P : For each x in X, there exists unique y in Y such that f(x)=y Q : For each y in Y, there exists x in X such that f(x) = y. R: there exist x underset 1, x underset 2 in X such that x underset 1 != xunderset 2 and f(x underset 1) = f(x underset 2). The negation of the statement "f is one-to-one and onto" is |
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Answer» <P>P or not R |
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