Characteristic Function (of a subset S of a universal set U) Definition/Meaning:

A function that indicates whether or not an element is a member of the subset S, It is the function

ƒ : U → {0, 1}

Defined as follow:

¦(x) = 1     if x Î s

¦(x) = 0     if x Ï s

The codomain might also be given as {true,false} or {1,2}.

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