Orders of Units in Modular Arithmetic by Keith Conrad
= Orders of Units in Modular Arithmetic by Keith Conrad
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By <Keith Conrad>.
Online text: https://kconrad.math.uconn.edu/blurbs/ugradnumthy/ordersmodm.pdf
Cited passages: Keith Conrad, Orders of Units in Modular Arithmetic, pp. 7–8, Theorem 4.5 and Remark 4.9.