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On Minkowski units constructed by special values of Siegel modular functions

Takashi Fukuda, Keiichi Komatsu (2003)

Journal de théorie des nombres de Bordeaux

Using the special values of Siegel modular functions, we construct Minkowski units for the ray class field k 6 of ( e x p ( 2 π i / 5 ) ) modulo 6 . Our work is based on investigating the prime decomposition of the special values and describing explicitly the action of the Galois group G ( k 6 / ) for the special values. Futhermore we construct the full unit group of k 6 using modular and circular units under the GRH.

On the asymptotic behavior of some counting functions

Maciej Radziejewski, Wolfgang A. Schmid (2005)

Colloquium Mathematicae

The investigation of certain counting functions of elements with given factorization properties in the ring of integers of an algebraic number field gives rise to combinatorial problems in the class group. In this paper a constant arising from the investigation of the number of algebraic integers with factorizations of at most k different lengths is investigated. It is shown that this constant is positive if k is greater than 1 and that it is also positive if k equals 1 and the class group satisfies...

On the asymptotic behavior of some counting functions, II

Wolfgang A. Schmid (2005)

Colloquium Mathematicae

The investigation of the counting function of the set of integral elements, in an algebraic number field, with factorizations of at most k different lengths gives rise to a combinatorial constant depending only on the class group of the number field and the integer k. In this paper the value of these constants, in case the class group is an elementary p-group, is estimated, and determined under additional conditions. In particular, it is proved that for elementary 2-groups these constants are equivalent...

On the existence of Minkowski units in totally real cyclic fields

František Marko (2005)

Journal de Théorie des Nombres de Bordeaux

Let K be a totally real cyclic number field of degree n that is the product of two distinct primes and such that the class number of the n -th cyclotomic field equals 1. We derive certain necessary and sufficient conditions for the existence of a Minkowski unit for K .

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