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### Pseudo-trisections and their diagrams

**Geometry/Topology**

Speaker: | Shintaro Fushida-Hardy, Stanford University |

Related Webpage: | http://stanford.edu/~sfh/ |

Location: | 2112 MSB |

Start time: | Thu, May 18 2023, 1:10PM |

We introduce pseudo-trisections of 4-manifolds with boundary and compare and contrast them with relative trisections. We will explore examples of surfaces embedded nicely in pseudo-trisected 4-manifolds and demonstrate how to diagrammatically compute several associated invariants, such as "which second homology class of the underlying 4-manifold is represented by the surface?".