qznc:
Integers are a finite ring [0]. What does that tell you? Does it help you that there is "multiplicative inverse modulo N" for every integer? If you do crypto or hash stuff, it sometimes does. Most programmers do not have to care, though.
On related topics: http://ericlippert.com/2013/11/14/a-practical-use-of-multiplicative-inverses/ Bye, bearophile
