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Sur un problème de L. Carlitz

Saïd El Baghdadi — 1995

Acta Arithmetica

1. Introduction. Dickson a conjecturé en 1909 dans [4] que toute forme binaire Q(X,Y) de degré pair 2r, r>1, à coefficients dans un corps fini q de caractéristique différente de 2 telle que, pour tout (a,b) de q × q distinct de (0,0), Q(a,b) soit un carré non nul de q est un carré dès que q dépasse une certaine borne N r qui ne dépend que de r. Cette conjecture a été démontrée en 1947 par Carlitz dans [1] où il a montré que, si d est un entier ≥2, q une puissance d’un nombre premier impair telle que...

Star operations in extensions of integral domains

David F. AndersonSaid El BaghdadiMuhammad Zafrullah — 2010

Actes des rencontres du CIRM

An extension D R of integral domains is t - (resp., t -) if ( I R ) - 1 = ( I - 1 R ) v (resp., ( I R ) v = ( I v R ) v ) for every nonzero finitely generated fractional ideal I of D . We show that strongly t -compatible implies t -compatible and give examples to show that the converse does not hold. We also indicate situations where strong t -compatibility and its variants show up naturally. In addition, we study integral domains D such that D R is strongly t -compatible (resp., t -compatible) for every overring R of D .

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