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Lower bound for class numbers of certain real quadratic fields

Mohit Mishra (2023)

Czechoslovak Mathematical Journal

Let d be a square-free positive integer and h ( d ) be the class number of the real quadratic field ( d ) . We give an explicit lower bound for h ( n 2 + r ) , where r = 1 , 4 . Ankeny and Chowla proved that if g > 1 is a natural number and d = n 2 g + 1 is a square-free integer, then g h ( d ) whenever n > 4 . Applying our lower bounds, we show that there does not exist any natural number n > 1 such that h ( n 2 g + 1 ) = g . We also obtain a similar result for the family ( n 2 g + 4 ) . As another application, we deduce some criteria for a class group of prime power order to be cyclic.

Majoration du premier zéro de la fonction zêta de Dedekind

Sami Omar (2000)

Acta Arithmetica

1. Introduction et notations. Soit K un corps de nombres de degré n, de signature ( r 1 , r 2 ) et de discriminant d K . Dans [Od], A. M. Odlyzko évoque le problème de savoir l’ordre de grandeur du premier zéro de la fonction zêta de Dedekind. Dans cette direction, une conjecture a été énoncée dans [To] qui dit que la hauteur du premier zéro est majorée par C / l n ( | d K | ) où C est une constante positive qui ne dépend que de n. L’idée de cette dernière inégalité provient d’un théorème de densité (sous GRH) dû a S. Lang [La1]....

Mean values connected with the Dedekind zeta-function of a non-normal cubic field

Guangshi Lü (2013)

Open Mathematics

After Landau’s famous work, many authors contributed to some mean values connected with the Dedekind zetafunction. In this paper, we are interested in the integral power sums of the coefficients of the Dedekind zeta function of a non-normal cubic extension K 3/ℚ, i.e. S l , K 3 ( x ) = m x M l ( m ) , where M(m) denotes the number of integral ideals of the field K 3 of norm m and l ∈ ℕ. We improve the previous results for S 2 , K 3 ( x ) and S 3 , K 3 ( x ) .

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