Speaker: Saiei Matsubara. Date: 10:30 24/07/2020 Title: Signature of the monodromy invariant hermitian form of GKZ system Abstract: In the study of monodromy groups, the monodromy invariant hermitian form (MIHF) plays an important role. MIHF is unique up to a scalar multiplication if the monodromy representation is irreducible. Recently, a combinatorial formula of the MIHF of regular holonomic GKZ(Gelfand-Kapranov-Zelevinsky) system is conjectured by F.Beukers and C.Verschoor. We explain how this conjecture follows from the intersection theory of twisted homology groups and its relation to the combinatorics of regular triangulations.