Find a pair of functions f and g, from set A to itself, such that f g D g f . Any of the
Chapter 26, Problem 26.10(choose chapter or problem)
Find a pair of functions f and g, from set A to itself, such that f g D g f . Any of the following will work: Choose f and g to be the same function. Choose f or g to be idA. Choose g D f 1 . Those are too easy. Find another example.
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