School of Technology and Computer Science Seminars
Bregman's Theorem
by Mr. Sagnik Mukhopadhyay (School of Technology and Computer Science, TIFR)
Friday, February 22, 2013
from
to
(Asia/Kolkata)
at Colaba Campus ( A-212 (STCS Seminar Room) )
at Colaba Campus ( A-212 (STCS Seminar Room) )
Description |
Abstract: Let A be an $n \times n$ boolean matrix, i.e., its entries come from the set $\{0,1\}$. Let $r_i$ denote the number of 1's in the row $i$. Also, let $S$ denote the set of permutations, $\sigma$, on $[n]$ such that $A_{i, \sigma(i)}=1$for all $i \in [n]$. Then the $perm(A)=|S|$. Bregman's theorem is stated as follows: $$perm(A) \leq \prod_{i\in [n]}(r_i !)^{1/r_i}$$ This upper bounds the number of perfect matchings in a bi-partite graph. We are going to prove it. |