单词	many‐to‐one
释义	many‐to‐one A function for which more than one element of the domain maps onto an element in the range. So f(x) = x2 is many‐to‐one if x is defined on the real numbers since f(a) = f(−a). A many‐to‐one function is not invertible, since there is no way to define a function to return more than one value. However, a many‐to‐one function can be restricted to a domain within which it is a one‐to‐one function, and for which the inverse function exists. If f(x) = x2 is restricted to x ≥ 0 then exists. See principal values.
随便看	false positive family fast Fourier transform Fatou's lemma feasible feasible region Feigenbaum, Mitchell Feit-Thompson theorem femto‐ Fermat, Pierre de Fermat point Fermat prime Fermat's Last Theorem Fermat's Little Theorem Fermat's Theorem Fermat's Two Squares Theorem Feuerbach's Theorem Feynman, Richard Phillips Fibonacci Fibonacci multiplication Fibonacci number fibre fictitious force field field extension

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