# talks

Past and upcoming talks

**Upcoming talks**

Vertex Operators in Enumerative Geometry, Tsinghua Sanya International Mathematics Forum, Hainan, December 2024.

**Past Talks:**

Wall-crossing for Calabi-Yau fourfolds and applications, Algebraic Geometry Workshop in Obergurgl, September 2024. slides

Equivariant Segre and Verlinde series for Quot-schemes, University of Vienna, September 2024.

Universal Virasoro constraints for additive categories, The University of Edinburgh, August 2024. webpage

Introductory lecture and a talk on Wall-crossing for Calabi-Yau fourfolds and applications, Heidelberg University, August 2024. slides

Universal Virasoro constraints for additive categories, Kavli Institute for the Physics and Mathematics of the Universe, July 2024. slides

Calabi—Yau four dg-quivers and wall-crossing, KIAS, July 2024. slides

Wall-crossing for Calabi-Yau fourfolds and applications, Yau Mathematical Sciences Center at Tsinghua University, June 2024. slides, video

Universal Virasoro Constraints for Additive Categories, Shanghai Center for Mathematical Sciences, May 2024.

Wall-crossing for Calabi-Yau Fourfolds and Applications, Algebra and Geometry Seminar, HKUST, April 2024 slides

An Intuitive Approach to Virasoro Constraints for Additive Categories, Algebra and Geometry Seminar, HKUST, April 2024. slides

Universal Virasoro Constraints for Quivers with Relations, Special algebraic geometry seminar, University of Vienna, December 2023. part 1, part 2

Wall-crossing for holomorphic Donaldson invariants and applications, Oslo STEW 2023, University of OSLO, December 2023. slides.

Universal Virasoro Constraints for Quivers with Relations, Algebraic geometry seminar, Academia Sinica, December 2023. part 1, part 2

Wall-Crossing for Holomorphic Donaldson Invariants and Its Applications, Workshop on moduli spaces, virtual invariants and shifted symplectic structures, KIAS, June 2023. slides

Wall-Crossing for Calabi-Yau Fourfolds and Applications, Skye 2023: Workshop on Hall algebras and vertex algebras in enumerative geometry, Isle of Skye, April 2023. notes

Equivariant Segre and Verlinde series for Quot-schemes, Algebra and geometry seminar, Stockholm University, March 2023. notes

An Intuitive Approach to Sheaf-theoretic Virasoro Constraints, Algebraic geometry seminar, Academia Sinica in Taipei, February 2023. slides video

Equivariant Segre and Verlinde Series for Quot-Schemes, Algebraic geometry and moduli seminar- ETH Zurich, January 2023. notes, Jiahui Huang gave the second part of the talk notes

Wall-Crossing for Calabi–Yau Fourfolds and Applications, Simons Collaboration on Special Holonomy Meeting, University of Oxford, January 2023. slides, video

Wall-Crossing for Virasoro Constraints, Utrecht Geometry Centre Seminar, University of Utrecht, November 2022. slides

Wall-Crossing for Calabi-Yau Fourfolds and Applications, M-Seminar, Kansas State University, November 2022. slides video

Virasoro for Moduli of Sheaves: The Wall-Crossing, Diablerets, Helvetic Algebraic Geometry Seminar, June 2022. The first version of the proof (including quivers) appears in these notes notes Miguel gave the introductory talk: notes

Wall-Crossing in Non-Commutative Calabi-Yau Four Categories, May 2022, slides

Wall-Crossing for Punctual Quot-schemes, University of Oslo, Algebra Seminar, January 2022.

Wall-Crossing for Hilbert Schemes of Fourfolds and Quot-Schemes of Surfaces, The London geometry and topology seminar, June 2021

Hilbert Schemes for Fourfolds and Quot-Schemes for Surfaces, Geometry & Analysis seminar - Oxford, April 2021

Wall-Crossing for Hilbert Schemes on Fourfolds and Quot-Schemes on Surfaces, UCSD Algebraic Geometry Seminar, April 2021

Wall-Crossing for Hilbert Schemes on CY 4-Folds II, Algebraic geometry and moduli seminar- ETH Zurich, March 2021.

Wall-Crossing for Hilbert Schemes on CY 4-Folds I, Algebraic geometry and moduli seminar- ETH Zurich, March 2021.

Orientation on the Moduli Stack of Compactly Supported Perfect Complexes over a Calabi-Yau 4-Fold, online, Oxford–London Gauge Assembly, August 2020. slides video

Orientations for DT Invariants on Quasi-Projective Calabi–Yau 4-Folds, Algebraic geometry seminar - Nottingham, November 2020. slides video

Non-Commutative Counting and Stability, University of Warwick, Summer-school on Bridgeland stability conditions, December 2019.