Injective in Discrete Maths?

"Injective, Surjective and Bijective" tells us about how a function behaves. Injective means we won't have two or more "A"s pointing to the same "B". ... So many-to-one is NOT OK (which is OK for a general function).

What is injective function example?

Injective function or injection of a function is also known as one one function and is defined as a function in which each element has one and only one image. This every element is associated with atmost one element. f:N→N:f(x)=2x is an injective function, as.

How do you know if a function is injective?

To show that a function is injective, we assume that there are elements a1 and a2 of A with f(a1) = f(a2) and then show that a1 = a2. Graphically speaking, if a horizontal line cuts the curve representing the function at most once then the function is injective.