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

Let J denote a simple closed curve in the plane. Let points a, b, c, d \in Joccur in this order when traversing J in a counterclockwise direction. Definep(a,b,c,d) to be the ratio of ab*cd+ad*bc to ac*bd, where zw denotes distancebetween z and w. Define P(J) to be the supremum of p over all such points.Harmaala & Kl\'en [1] provided bounds on P(J) when J is an ellipse or rectangleof eccentricity \epsilon. We nonrigorously give formulas for P(J) here, in thehope that someone else can fill gaps in our reasoning.

Ptolemy Constants as Described by Eccentricity