(thing) by ariels Sat May 27 2000 at 9:26:21
A function f:A -> X is said to be one to one if it maps different elements to different elements, i.e. if f(a)=f(b) iff a=b.

For example, on the real number line R, f(x)=x3 is one to one, but f(x)=x2 is not.

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