Till Wehrhan
Welcome to my homepage! I am a second year 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, quantum cohomology.
Upcoming Teaching:
- Tutor for algebraic geometry I; Lecturer: Dr. Martin, Winter 2022.
Past Teaching:
- 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.
Upcoming Seminar Talks:
- IMPRS Seminar talk, Bonn, date tba.
Selected Seminar and Conference Talks:
- 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
Prof. Valentin Blomer und Prof. Georg Oberdieck erhalten ERC grants
Prof. Peter Scholze erhält Lehrpreis der Universität
Ausschreibung: W3-Professur Reine Mathematik
Bonn Mathematics ranked 15th in Shanghai Ranking
Prof. Carl-Friedrich Bödigheimer hat Daidalos-Münze der Studienstiftung erhalten
Grants for Mathematics students from Ukraine
Corona: Measures at the Center for Mathematics
Prof. Jessica Fintzen is awarded a Whitehead Prize of the London Mathematical Society
Georg Oberdieck receives Dubrovin Medal 2022
Prof. Peter Scholze elected as Foreign Member of the Royal Society
Prof. Dr. Jessica Fintzen new at the Mathematical Institute
Otto Toeplitz memorial fund established
Hausdorff Memorial Prize 2020/2021 awarded
Bachelorpreis 2020/21 der BMG verliehen
Prof. Christoph Thiele is holding the Clay Lecture 2022
Hausdorff Edition „Felix Hausdorff - Gesammelte Werke“
Prof. Catharina Stroppel invited as plenary speaker to the ICM 2022 in St. Petersburg
Bonner Mathematik belegt bei Shanghai Ranking den 1. Platz in Deutschland und weltweit den 13. Platz
Prof. Georg Oberdieck erhält Heinz Maier-Leibnitz-Preise 2020
Prof. Daniel Huybrechts erhält gemeinsam mit Debarre, Macri und Voisin ERC Synergy Grant