In each of 15-18 a function f is defined on a set of real numbers. Determine whether or not one-to-one and justify answer. , for each number
Whether a given function is one-to-one or not.
for all real numbers .
In one-to-one function, distinct elements in domain are mapped with distinct elements in codomain.
If is a function defined on an infinite set is one to one if and only if the following universal statement is true.
In this case, the function defined on .
To determine one-to-one, consider
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