2 papers
math.GT2025
An Extension of Khovanov Homology to Immersed Surface Cobordisms
Scott Carter, Benjamin Cooper, Mikhail Khovanov +1
We show that an oriented surface in containing double point singularities induces a map between the Khovanov homology groups of its boundary links in a functorial wa…
math.CT2024
Hall algebras via 2-Segal spaces
Benjamin Cooper, Matthew B. Young
This is an introduction to Hall algebras from the perspective of -Segal spaces or decomposition spaces, as introduced by Dyckerhoff and Kapranov and Gálvez-Carrillo, Kock and T…