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The Trisection Genus of Standard Simply Connected PL 4-Manifolds Spreer, Jonathan Tillmann, Stephan combinatorial topology triangulated manifolds simply connected 4-manifolds K3 surface trisections of 4-manifolds Gay and Kirby recently introduced the concept of a trisection for arbitrary smooth, oriented closed 4-manifolds, and with it a new topological invariant, called the trisection genus. In this note we show that the K3 surface has trisection genus 22. This implies that the trisection genus of all standard simply connected PL 4-manifolds is known. We show that the trisection genus of each of these manifolds is realised by a trisection that is supported by a singular triangulation. Moreover, we explicitly give the building blocks to construct these triangulations. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Jonathan Spreer and Stephan Tillmann 2018 Is Part Of LIPIcs, Volume 99, 34th International Symposium on Computational Geometry (SoCG 2018) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.SoCG.2018.71 urn:nbn:de:0030-drops-87847 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2018.71 eng https://creativecommons.org/licenses/by/3.0/legalcode