Calculating the homology and intersection form of a 4-manifold from a trisection diagram

Peter Feller, Michael Klug, Trent Schirmer +1

Given a diagram for a trisection of a 4-manifold $X$, we describe the homology and the intersection form of $X$ in terms of the three subgroups of $H_1(\Sigma ;\mathbb{Z})$ generated by…