# OpAlg seminar: Yasuyuki Kawahigashi

Speaker: Yasuyuki Kawahigashi (University of Tokyo)

Title:  Topological phases of matter and subfactors

Abstract:  Topological phase of matter is described with a modular tensor category and subfactor theory is useful for understanding modular tensor categories.  With subfactor methods, we disprove a conjecture of physicists and mathematically formulate a physical notion.