arXiv subjects

Kálmán Cziszter

Publications and source records attributed to Kálmán Cziszter.

3 recordsLinked to original sources

arXiv2024

The directed Cayley diameter and the Davenport constant

The directed Cayley diameter of a finite group is investigated in terms of the monoid of product-one sequences over the group, via the new notion of directed geodesic atoms. Two quantities associated to the set of directed geodesic atoms provide lower and upper bounds for the directed Cayley diameter. An algorithm for computing the directed geodesic atoms is implemented in GAP, and is applied to determine the above mentioned quantities for all non-abelian groups of order at most $42$, and for the alternating group of degree $5$. Furthermore, the small and large Davenport constants of all these groups are computed (excepting the large Davenport constant for $A_5$), extending thereby the formerly obtained results on the groups of order less than $32$. Along the way the directed Cayley diameter of a finite abelian group is expressed in terms of its invariants.

math.GR↗

arXiv2018

The Noether numbers and the Davenport constants of the groups of order less than 32

The computation of the Noether numbers of all groups of order less than thirty-two is completed. It turns out that for these groups in non-modular characteristic the Noether number is attained on a multiplicity free representation, it is strictly monotone on subgroups and factor groups, and it does not depend on the characteristic. Algorithms are developed and used to determine the small and large Davenport constants of these groups. For each of these groups the Noether number is greater than the small Davenport constant, whereas the first example of a group whose Noether number exceeds the large Davenport constant is found, answering partially a question posed by Geroldinger and Grynkiewicz.

math.GR↗

arXiv2018

On the Noether number of $p$-groups

A group of order $p^n$ ($p$ prime) has an indecomposable polynomial invariant of degree at least $p^{n-1}$ if and only if the group has a cyclic subgroup of index at most $p$ or it is isomorphic to one of two particular groups of small order.

math.GR↗