Mathematics, 10.06.2020 05:57, scottkayce

The notation f:S→T denotes that f is a function, also called a map , defined on all of a set S and whose outputs lie in a set T . A function f:S→T is injective if for all x, y∈S , f(x)=f(y) implies that x=y . Alternatively: a function is injective if we can uniquely recover some input x based on an output f(x) . What functions are injective?

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The notation f:S→T denotes that f is a function, also called a map , defined on all of a set S and w...