Let A = 5x, y6 and let A* be the set of all strings of finite length made up of symbols
Chapter 5, Problem 21(choose chapter or problem)
Let A = 5x, y6 and let A* be the set of all strings of finite length made up of symbols from A. A function f: A* S A* is defined as follows: For s in A*, f(s) is the string obtained by writing the characters of s in reverse order. Is f one-to-one? Prove or disprove. Is f onto? Prove or disprove.
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