When is the group of units in the integers modulo n cyclic?
A proof of the classification of integers whose multiplicative group of units is cyclic.
A mathematics notebook
Tagged: number-theory
Notes on integrals, infinite series, and number theory.
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Weyl's Equidistribution Theorem
Weyl's criterion connects uniform distribution modulo one with exponential sums and averages of Riemann-integrable functions.
Eisenstein's Proof of Quadratic Reciprocity
Eisenstein's trigonometric proof of quadratic reciprocity, starting with Euler's criterion and Gauss's lemma.