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True. In order for a function to be one-to-one, no two elements of the range may be paired with the same value of the domain. One-to-one means that each value of the range will generate a distinct value of the domain and, if the process is reversed, each value of the domain will generate the same distinct value of the range.

In particular, polynomials with degree higher than one (linear) are not one-to-one unless there are no minimums or maximums, i.e. the second derivative never changes sign.

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