Centerpole sets for colorings of Abelian groups

Details Centerpole sets for colorings of Abelian groups Centerpole sets for colorings of Abelian groups

2010-03-12

arxiv.org/abs/1003.2588v3

Journal of Algebraic Combinatorics, 34:2 (2011) 267--300

Mathematics

Combinatorics

20 pages

Scientific paper

Given a topological group $G$ we calculate or evaluate the cardinal characteristic $c_k(G)$ (and $c_k^B(G)$) equal to the smallest cardinality of a $k$-centerpole subset $C\subset G$ for (Borel) colorings of $G$. A subset $C\subset G$ of a topological group $G$ is called {\em $k$-centerpole} if for each (Borel) $k$-coloring of $G$ there is an unbounded monochromatic subset $G$, which is symmetric with respect to a point $c\in C$ in the sense that $S=cS^{-1}c$.

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