Birkhoff polytope

The Birkhoff polytope Bn (also called the assignment polytope, the polytope of doubly stochastic matrices, or the perfect matching polytope of the complete bipartite graph [1]) is the convex polytope in RN (where N = n2) whose points are the doubly stochastic matrices, i.e., the n × n matrices whose entries are non-negative real numbers and whose rows and columns each add up to 1. It is named after Garrett Birkhoff.

  1. ^ Ziegler, Günter M. (2007) [2006], Lectures on Polytopes, Graduate Texts in Mathematics, vol. 152 (7th printing of 1st ed.), New York: Springer, p. 20, ISBN 978-0-387-94365-7