A Combinatorial Proof of Rayleigh Monotonicity for Graphs

Josef Cibulka1, Jan Hladky2, Michael A.La Croix3, David G.Wagner3
1DEPARTMENT OF APPLIED MATHEMATICS, CHARLES UNIVERSITY, MALOSTRANSKE NAM. 25, 118 00 PRAHA 1, CZECH REPUBLIC
2DEPARTMENT OF APPLIED MATHEMATICS, CHARLES UNIVERSITY, MALOSTRANSKE NAM. 25, 118 00 PraHaA 1, CZECH REPUBLIC AND ZENTRUM MATHEMATIK (GRUPPE M9), TECHNISCHE UNIVERSITAT MUNCHEN, BOLTZMANNSTRASSE 3, D-85747 GARCHING BEI MUONCHEN, GERMANY
3DEPARTMENT OF COMBINATORICS AND OPTIMIZATION, UNIVERSITY OF WATERLOO, WATERLOO, ONTARIO, CANADA N2L 3G1

Abstract

We give an elementary, self-contained, and purely combinatorial proof of the Rayleigh monotonicity property of graphs.