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I am a postdoctoral fellow at the Max Planck Institute for Mathematics, working in the group of Viktoriya Ozornova. Before this, I was a Ph.D. candidate at the Mathematical Institute of Utrecht University under the supervision of Lennart Meier.
My research interests lie in the realm of homotopy theory, with a main focus on higher category theory.
✉️ ruit@mpim-bonn.mpg.de
Research
Publications
A short proof of the straightening theorem
with F. Hebestreit and G. Heuts
Transactions of the American Mathematical Society B, 12 (2025), 697–747.
arXiv:2111.00069A pasting theorem for iterated Segal spaces
Journal of Pure and Applied Algebra, 228 (2024), no. 11, 107712.
arXiv:2210.04549
Preprints
Day convolution for algebraic patterns
with T. Blom and F. Loubaton
Last updated on: 31 Mar. 2026.
arXiv:2603.29815On the squares functor and the Gaitsgory–Rozenblyum conjectures
with F. Loubaton
Submitted. Last updated on: 25 Jul. 2025.
arXiv:2507.07807Formal category theory in ∞-equipments II
Last updated on: 8 Aug. 2024.
arXiv:2408.15190Homotopy coherent companionships and conjunctions
Submitted. Last updated on: 8 Apr. 2025.
arXiv:2408.14335Formal category theory in ∞-equipments I
Submitted. Last updated on: 25 Sep. 2025.
arXiv:2308.03583
Theses
On multiple ∞-categories and formal category theory via ∞-equipments
Ph.D. thesis, Utrecht University, Apr. 2025.Grothendieck constructions in higher category theory
Master's thesis, Utrecht University, Aug. 2020.
Organization
I am/was involved in the organization of the following activities:
Abstract homotopy theory seminar, Bonn, 2025-2026.
Conference on (∞,n)-categories and their applications, Utrecht, 15-19 April, 2024.
Junior chromatic homotopy theory seminar, Utrecht, 2021-2022.
Chromatic homotopy theory seminar, Utrecht, 2021-2022.
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