adjective
relating to or characterized by injection, especially denoting a function in which each element of the domain is mapped to a distinct element in the codomain
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The function is injective if each element in the domain maps to a unique element in the codomain.
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An injective function means that each input has its own distinct output.
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If the function is injective, it means each number gets its own special spot.
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Being injective is like having a one-to-one correspondence between two sets.