Download or read book Unimodal Log-Concave and Polya Frequency Sequences in Combinatorics written by Francesco Brenti and published by American Mathematical Soc.. This book was released on 1989 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many sequences of combinatorial interest are known to be unimodal or log-concave and there has been a considerable amount of interest devoted to this topic. The main object of this work is to point out another branch of mathematics that can be successfully used to attack these kinds of problems, namely, the theory of total positivity.