On covers of abelian groups by cosets

Details On covers of abelian groups by cosets On covers of abelian groups by cosets

2004-11-07

arxiv.org/abs/math/0411144v2

Acta Arith. 131(2008), no.4, 341-350

Mathematics

Group Theory

10 pages, also related to Number Theory and Combinatorics

Scientific paper

Let G be any abelian group and {a_sG_s}_{s=1}^k be a finite system of cosets of subgroups G_1,...,G_k. We show that if {a_sG_s}_{s=1}^k covers all the elements of G at least m times with the coset a_tG_t irredundant then [G:G_t]\le 2^{k-m} and furthermore k\ge m+f([G:G_t]), where f(\prod_{i=1}^r p_i^{alpha_i})=\sum_{i=1}^r alpha_i(p_i-1) if p_1,...,p_r are distinct primes and alpha_1,...,alpha_r are nonnegative integers. This extends Mycielski's conjecture in a new way and implies a conjecture of Gao and Geroldinger. Our new method involves algebraic number theory and characters of abelian groups.

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