Till Wehrhan
Welcome to my homepage! I am a PhD student of Prof. Stroppel and funded by the Max Planck Institute for Mathematics Bonn.
Contact:
Email: wehrhan[at]mpim-bonn.mpg.de
Research Interests:
Geometric representation theory, quantum groups, (equivariant) Schubert calculus, bow varieties, quantum cohomology.
Preprints/Publications:
- Existence and Orthogonality of stable envelopes for bow varieties; joint with Catharina Stroppel; ArXiv preprint.
- Chevalley-Monk formulas for bow varieties; ArXiv preprint.
Teaching:
- Tutor for Algebraic geometry I; Lecturer: Dr. Martin, Winter 2022.
- Coorganizer of a graduate seminar about bow varieties and 3d mirror symmetry; Summer 2022.
- Tutor for advanced algebra (crystals and canonical bases); Lecturer: Prof. Stroppel, Winter 2021.
- Tutor for Auslander-Reiten theory; Lecturer: Prof. Schröer, Summer 2021.
- Tutor for homological algebra; Lecturer: Prof. Schröer, Winter 2020.
- Tutor for representation theory of finite dimensional algebras; Lecturer: Prof. Schröer, Summer 2020.
- Tutor for modular forms; Lecturer: Prof. Blomer, Winter 2019.
- Tutor for the precourse in mathematics; Lecturer: Dr. Rieger, Summer 2019.
- Instructor of the repetition course in commutative algebra; Summer 2019.
- Tutor for commutative algebra; Lecturer: Dr. Heidersdorf, Summer 2019.
- Tutor for invariant theory and algebraic groups; Lecturer: Prof. Stroppel, Winter 2018.
- Tutor for the precourse in mathematics; Lecturer: Dr. Welter, Summer 2018.
- Tutor for the precourse in mathematics; Lecturer: Dr. Welter, Summer 2017.
- Tutor for calculus II; Lecturer: Prof. Niethammer, Summer 2017.
Selected Seminar and Conference Talks:
- Geometry, Algebra, and Theoretical Physics Seminars London, 03/2024.
- Paris Algebra Seminar Paris, 01/2024.
- Workshop in honor of Peter Littelmann Cologne, 12/2023.
- Schubert Seminar, Rutgers University (online) 11/2023.
- EGRET Seminar Edinburgh, 11/2023.
- Chevalley-Monk formulas for bow varieties; IMPRS Seminar, Bonn, 11/2023.
- Chevalley-Monk formulas for bow varieties; Thesisday of Prof. Stroppel's working group, Bonn, 01/2023.
- Rim hook rules in equivariant quantum Schubert calculus via Bethe and Clifford algebras; Seminar on methods in geometric representation theory, Chapel Hill, 09/2022.
- Carlsson-Okounkov operator; Seminar on algebraic geometry, Bonn, 07/2022.
- Diagrammatics of quiver Schur algebras; Seminar on representation theory, Bonn, 06/2022.
- Conjectural picture of 3d mirror symmetry; Seminar on bow varieties and 3d mirror symmetry, Bonn, 05/2022.
- Generalizations of Schubert calculus; Workshop on Curves and K3 surfaces (junior talk), Bonn, 05/2022.
- Torus actions on bow varieties; Seminar on bow varieties and 3d mirror symmetry, Bonn, 05/2022.
- Flag varieties and modular representation theory; IMPRS Seminar, Bonn, 04/2022.
- Quantum $K$-theory and $3d$ mirror symmetry for hypertoric varieties; ArXiv Seminar, Bonn, 01/2022.
- $K$-theoretic sheaf counting on threefolds; IMPRS Seminar, Bonn, 01/2022.
- Virtual localization formula (after Graber-Pandharipande); Seminar on algebraic geometry, Bonn, 12/2021.
- Yetter-Drinfeld modules and Frobenius algebras; Seminar on representation theory, Bonn, 11/2021.
- Operations on $D$-modules II; Reading group on mixed Hodge modules, Bonn, 10/2021.
- Operations on $D$-modules I; Reading group on mixed Hodge modules, Bonn, 10/2021.
- Stable envelopes and bow varieties; ArXiv Seminar, Bonn 07/2021.
- On curve counting and quantum groups; BIGS exhibition, Bonn 06/2021.
- Yang-Baxter algebra operation on the cohomology of Grassmannians; Thesisday of Prof. Stroppel's working group, Bonn 06/2021.
- Yang-Baxter equation: origins and connection to symmetric polynomials; IMPRS Seminar, Bonn 04/2021.
- Quantum cohomology of the Hilbert scheme of points in the plane; Seminar on algebraic geometry, Bonn 02/2021.
- From triply graded to $\mathfrak gl_N$-homology; Seminar on knot homology, Bonn 02/2021.
- Beauville decomposition of the Chow ring of abelian varieties; IMPRS Seminar, Bonn 01/2021.
- Quantum cohomology of Grassmannians; Seminar on algebraic geometry, Bonn 12/2020.
- Small quantum cohomology; Seminar on algebraic geometry, Bonn 12/2020.
- Gromov-Witten invariants and big quantum cohomology; Seminar on algebraic geometry, Bonn 11/2020.
- Exceptional collections for Grassmannians; Seminar on representation theory, Bonn 07/2020.
- Alternating quiver Hecke algebras; Master thesis talk, Bonn 06/2020.
- Hall-Algebra of $\mathbb F_1$ representations; Seminar on advanced algebra, Bonn 12/2019.
- FRT-construction and quantum groups; Seminar on algebraic geometry, Bonn 11/2019.
- Introduction to equivariant cohomology; Seminar on representation theory, Bonn 07/2019.
- Lines on projective surfaces; Seminar on representation theory, Bonn 06/2019.
- Structure theorems for Hopf algebras; Seminar on topology, Bonn 05/2019.
- Multilinear restriction estimate; Seminar on harmonic analysis, Bonn 11/2018.
- Hall algebras and quiver representations; Seminar on representation theory, Bonn 10/2018.
- The Steenrod algebra; Seminar on topology, Bonn 06/2018.
Theses:
- Representation theory of alternating nil Hecke algebras; Master thesis; Supervisor: Prof. Stroppel.
- Aspekte der Darstellungstheorie von $\operatorname{GL}_2(\mathbb F_q)$, $\operatorname{SL}_2(\mathbb F_q)$ und $\operatorname{GL}_2(\mathbb Q_p)$; Bachelor thesis; Supervisor: Prof. Stroppel.
If you are interested in my theses, please contact me via mail.
News
Bonn mathematics performs excellently again in QS ranking
Stefan Schwede is invited speaker at the ECM 2024 in Sevilla
Jessica Fintzen wins Cole Prize
Regula Krapf receives university teaching award
Catharina Stroppel joined the North Rhine-Westphalia Academy for Sciences and Arts
Daniel Huybrechts receives the Compositio Prize for the periode 2017-2019
Catharina Stroppel receives Gottfried Wilhelm Leibniz Prize 2023
Grants for Mathematics students from Ukraine
Jessica Fintzen is awarded a Whitehead Prize of the London Mathematical Society
Peter Scholze elected as Foreign Member of the Royal Society