What is Injective function or One-One function ??
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, an injective function or injection or one-to-one function is a function that preserves distinctness: it never maps distinct elements of its domain to the same element of its codomain. In other words, every element of the function's codomain is the image of at most one element of its domain.
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One-One function :
A function f such that X to Y is called one-one function or it is also called as Injective function or if image of all the distinct elements of x under f are also distinct.
Thus f such that X to Y is one to one if and only,
f(x) = f(y)
then x = y
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