Vari\'et\'es de Prym associ\'ees aux rev\etements n-cycliques d'une courbe hyperelliptique
Abstract
Let H a hyperelliptic curve and let f: C --> H be a cyclic etale covering of degree n, associated to a line bundle in Pic0 (H) of order n . We prove that the Prym variety P=Prym(C / H) is isomorphic, as abelian varieties, to a product of jacobians when n is not divisible by 4.
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