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

Autoři 1998 Článek v odborném periodiku Acta Math. et Informatica Univ. Ostraviensis Obecná matematika class number; cyclotomic unit; crossed homomorphism This paper considers the parity of the class number of any field extension of the rationals by square roots of three disctinct primes p,q,r, where p=2, and q,r are congruent to 1 mod 4.