activity
20162026
most citedLocally (co)Cartesian fibrations as realisation fibrations and the classifying space of cospans

6 citations · 15 across the 10 of their papers we have counts for

collaborators

11 papers

math.GT2026

The prime decomposition fibre sequence for moduli spaces of reducible 3-manifolds

Rachael Boyd, Corey Bregman, Jan Steinebrunner

We study the moduli space , for a reducible, oriented 3-manifold with irreducible prime factors . A programme of César de Sá-Rourke, Hendri…

math.AT2025

Open 2D TFTs admit initial open-closed extensions

Shaul Barkan, Jan Steinebrunner, Adela YiYu Zhang

We show that any open 2-dimensional topological field theory valued in a symmetric monoidal -category (with suitable colimits) extends canonically to an open-closed field t…

math.CT2025

2-dimensional TFTs via modular -operads

Jan Steinebrunner

This lecture series is based on joint work in progress with Shaul Barkan, as well as work in progress of the author. The five sections of these notes correspond to the five lecture…

math.AT2023★ 2 cited

Segalification and the Boardman-Vogt tensor product

Shaul Barkan, Jan Steinebrunner

We develop an analog of Dugger and Spivak's necklace formula providing an explicit description of the Segal space generated by an arbitrary simplicial space. We apply this to obtai…

math.AT2022★ 1 cited

The equifibered approach to -properads

Shaul Barkan, Jan Steinebrunner

We define a notion of -properads that generalises -operads by allowing operations with multiple outputs. Specializing to the case where each operation has a single…

math.CT2022★ 4 cited

Envelopes for Algebraic Patterns

Shaul Barkan, Rune Haugseng, Jan Steinebrunner

We generalize Lurie's construction of the symmetric monoidal envelope of an -operad to the setting of algebraic patterns. This envelope becomes fully faithful when sliced o…

math.AT2021

The surface category and tropical curves

Jan Steinebrunner

We compute the classifying space of the surface category whose objects are closed oriented -manifolds and whose morphisms are diffeomorphism classes of orient…

math.AT2020★ 1 cited

The classifying space of the one-dimensional bordism category and a cobordism model for TC of spaces

Jan Steinebrunner

The homotopy category of the bordism category has as objects closed oriented -manifolds and as morphisms diffeomorphism classes of -dimensional bordisms. Using…

math.AT2019★ 6 cited

Locally (co)Cartesian fibrations as realisation fibrations and the classifying space of cospans

Jan Steinebrunner

We show that the conditions in Steimle's 'additivity theorem for cobordism categories' can be weakened to only require \emph{locally} (co)Cartesian fibrations, making it applicable…

math.CT2018★ 1 cited

The space of traces in symmetric monoidal infinity categories

Jan Steinebrunner

We define a tracelike transformation to be a natural family of conjugation invariant maps for all dualisable objects in any symmetric monoi…

math.AT2016

Homotopy- and Cohomology Groups of Kan Complexes

Jan Steinebrunner

This article shows several new methods for proofs on Kan complexes while using them to give a compact introduction to the homotopy groups of these complexes. Then more advanced obj…