Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6424403 | European Journal of Combinatorics | 2011 | 4 Pages |
Abstract
In a 1965 paper, ErdÅs remarked that a graph G has a bipartite subgraph that has at least half as many edges as G. The purpose of this note is to prove a matroid analogue of ErdÅs's original observation. It follows from this matroid result that every loopless binary matroid has a restriction that uses more than half of its elements and has no odd circuits; and, for 2â¤kâ¤5, every bridgeless graph G has a subgraph that has a nowhere-zero k-flow and has more than kâ1k|E(G)| edges.
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
James Oxley,