Is the Given Function Injective?

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A function is injective (or one-to-one) if different inputs give different outputs. In symbols, is injective if whenever , then . To show that a function is not injective, find such that . Graphically, this means that a function is not injective if its graph contains two points with different values and the same value.

Contributed by: Izidor Hafner (March 2011)
Open content licensed under CC BY-NC-SA




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