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# On the Parity of the Class Number of the Field $Q(\sqrt p,\sqrt q,\sqrt r)$

Autoři Článek v odborném periodiku Journal of Number Theory Obecná matematika class number; cyclotomic unit; crossed homomorphism In this paper compute the parity of the class number of the field Q(\sqrt p, \sqrt q, \sqrt r), where p, q and r are different primes, all congruent to 1 modulo 4.