OIST Representation Theory Seminar

Robert Spencer, University of Cambridge

Title: (Some) Gram Determinants for \(A_n\) nets

Abstract: The nets giving a diagrammatic description of the category of (tensor products of) fundamental representations of \(sl_n\) form a cellular category. We can then ask about the natural inner form on certain cell modules. In this talk, we will calculate the determinant of some of these forms in terms of certain traces of clasps or magic weave elements (for which there is a conjectured formula due to Elias). The method appears moderately general and gives a result which is hopefully illuminating and applicable to other monoidal, cellular categories.