The genus zeta function of hereditary orders in central simple algebras over global fields

Author:
M. Denert

Journal:
Math. Comp. **54** (1990), 449-465

MSC:
Primary 11R54; Secondary 16A18

MathSciNet review:
993928

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Abstract: Louis Solomon introduced the notion of a zeta function of an order in a finite-dimensional central simple *K*-algebra *A*, with *K* a number field or its completion (*P* a non-Archimedean prime in *K*). In several papers, C. J. Bushnell and I. Reiner have developed the theory of zeta functions and they gave explicit formulae in some special cases. One important property of these zeta functions is the Euler product, which implies that in order to calculate , it is sufficient to consider the zeta function of local orders . However, since these local orders are in general not principal ideal domains, their zeta function is a finite sum of so-called 'partial zeta functions'. The most complicated term is the 'genus zeta function', , which is related to the free -ideals. I. Reiner and C. J. Bushnell calculated the genus zeta function for hereditary orders in quaternion algebras (i.e., ). The authors mention the general case but they remark that the calculations are cumbersome. In this paper we derive an explicit method to calculate the genus zeta function of any local hereditary order in a central simple algebra over a local field. We obtain as a finite sum of explicit terms which can be calculated with a computer. We make some remarks on the programming of the formula and give a short list of examples. The genus zeta function of the minimal hereditary orders (corresponding to the partition (1, 1, ... , 1) of *n*) seems to have a surprising property. In all examples, the nominator of this zeta function is a generating function for the *q*-Eulerian polynomials. We conclude with some remarks on a conjectured identity.

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DOI:
http://dx.doi.org/10.1090/S0025-5718-1990-0993928-7

Article copyright:
© Copyright 1990
American Mathematical Society