The cyclotomic numbers of order seven are given in terms of the solutions of a certain system of three quadratic diophantine equations. This is analogous to L. E. Dickson's evaluation of the ...
The class numbers $h_{l}^+$ of the real cyclotomic fields $Q(\zeta_{l} + \zeta_{l}^{-1})$ are notoriously hard to compute. Indeed, the number $h_{l}^+$ is not known ...
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