Automorphisms Of A Directed Square
Cryptography Reading Assignment
Once we have a set of permutations, we'd like to be able to combine them to get new permutations. The previous problem used repetition on simple shift permutations of the alphabet to obtain additional permutations. The next problem has you show that the composition of any finite collection of permutations on a set is always a permutation.
The Composition Of Permutations Is A Permutation
Do We Need The Associative Law
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