J. V. van Ittersum

Quasimodularity of $q$-series associated to root lattices

Motivated by conjectures arising in part from the study of class-$\mathcal{S}$ vertex algebras associated with four-dimensional supersymmetric field theories, we study multiple $q$-zeta functions attached to finite-dimensional simple Lie algebras. We prove their conjectured quasimodularity for all classical Lie algebra...