English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The Hankel matrix of type B Narayana polynomials was proved to be totallypositive by Wang and Zhu, and independently by Sokal. Pan and Zeng raised theproblem of giving a planar network proof of this result. In this paper, wepresent such a proof by constructing a planar network allowing negativeweights, applying the Lindstr\"om-Gessel-Viennot lemma and establishing aninvolution on the set of nonintersecting families of directed paths.

A planar network proof for Hankel total positivity of type $B$ Narayana polynomials