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

In 1975, Plesn\'ik characterized all triangle-free planar graphs as having adiameter $2$. We characterize all triangle-free projective-planar graphs havinga diameter $2$ and discuss some applications. In particular, the main result isapplied to calculate the analogue of clique numbers for graphs, namely, coloredmixed graphs, having different types of arcs and edges.

Triangle-free projective-planar graphs with diameter two: domination and characterization