Sebastian Ørsted

collaborators

3 papers

math.AC2025

The ring of $ω$ -invariant symmetric functions in characteristic 2

Sebastian Ørsted

We provide a simple presentation by generators and relations of the ring of $ω$ -invariant symmetric functions over the field $F_{2}$ . Here, $ω$ denotes the standard involu…

math.CT2018

Homotopy limits in the category of dg-categories in terms of $A_{\infty}$ -comodules

Sergey Arkhipov, Sebastian Ørsted

In this paper, we apply an explicit construction of a simplicial powering in dg-categories, due to Holstein (2016) and Arkhipov and Poliakova (2018), as well as our own results on…

math.CT2018

Homotopy (co)limits via homotopy (co)ends in general combinatorial model categories

Sergey Arkhipov, Sebastian Ørsted

We prove and explain several classical formulae for homotopy (co)limits in general (combinatorial) model categories which are not necessarily simplicially enriched. Importantly, we…

The ring of ω-invariant symmetric functions in characteristic 2

Homotopy limits in the category of dg-categories in terms of A∞​-comodules

Homotopy (co)limits via homotopy (co)ends in general combinatorial model categories

The ring of $ω$ -invariant symmetric functions in characteristic 2

Homotopy limits in the category of dg-categories in terms of $A_{\infty}$ -comodules