An injective function, also known as a one-to-one function, is a type of function in mathematics that preserves distinctness: if two inputs to the function are different, then their outputs will also be different.

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Injective function by Ciro Santilli 37 Updated 2025-07-16
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Mnemonic: in means into. So we are going into a codomain that is large enough so that we can have a different image for every input.
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