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Let A be the set of 2 6 letters of the alphabet. Let B be the numbers from 0 to 2 5 . A simple
Let be the set of letters of the alphabet. Let be the numbers from to A simple code might replace each letter with the number corresponding to its index in the list. The function from letters to their numbers would have type
:
A shift of in this code might add to each output wrapping around. This can be done with modular arithmetic as
What is the type of
:
The shifted code could be written as the following composition of s and c
All of the functions described here are bijections. What is
mod,.
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