| http://www.w3.org/ns/prov#value | - If n is a positive integer, the integers between 1 and n ??? 1 which are coprime to n (or equivalently, the congruence classes coprime to n) form a group with multiplication modulo n as the operation; it is denoted by Zn?? and is called the group of units modulo n or the group of primitive classes modulo n.
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