If F is a function from a set X to a set Y, then F is not one-to-one if, and only if,_________
To fill the blank in the statement “If is a function from set to set , then is not one-to-one if, and only if, ________.”
is given as a function from a set to a set .
Let be an one-to-one function from to .
Then for belong to ,
If , then, and,
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