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The set of all possible output values of a function. (The set of actual output values is called the range.) Or in other words the set of values that the output values lie in. Example: if the function is the square of the natural numbers N = {1,2,3,...}, then * the domain (input values) is N * the codomain (possible output values) is N * the range (actual output values) is {0,1,2,4,9,16,...} | |