# One To One Function

A function f: A -> B is said to be a one-one (or Injective) function, if for each element of A, there is a different element of B.

Hence f: A -> B is a one-one function

=> [a1, a2 A, a1 ≠ a2 => f(a1) ≠ f(a2)]

=> [f(a1) = f(a2) => a1 = a2]

For example:
f1

Here f1 is a one to one function.

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