LAGOON: Leicester Algebra and Geometry Open ONline

These seminars are organized by Frank Neumann and Sibylle Schroll, University of Leicester

This Algebra and Geometry webinar series has a strong focus on Representation Theory and Algebraic Geometry and their many interactions covering topics such as homological mirror symmetry, stability conditions, derived categories, dg-categories, Hochschild cohomology of algebras, moduli spaces and algebraic stacks, derived algebraic geometry etc.

These seminars take place on Thursday at 12:00-13:00 (BST)

To sign up to participate in these seminars, please complete this form.

Registration will close at 11.00 each Thursday.

You will be sent a link to the Zoom meeting on Thursday morning

Please note, as of October 1 the seminar series will change to 12:00-13:00 (BST)

These seminars are recorded. All recordings can be found here.

Forthcoming seminars:

Future speaker details can be found here.

Please note, as of October 1 the seminar series will change to 12:00-13:00 (BST)

22 October

Lang Mou

Caldero–Chapoton formulas for generalized cluster algebras from orbifolds

Abstract: To a marked bordered surface with orbifold points of order 3, we associated a quiver (with loops) with potential. We then connect the cluster structure of the corresponding skew-symmetrizable matrix with the stability conditions and the \tau-tiliting theory of the Jacobian algebra. Finally we provide Caldero–Chapoton type formulas for cluster monomials of the generalized cluster algebra of Chekhov and Shapiro associated to the surface. This is joint work with Labardini-Fragoso.


29 October

Michael Wemyss (Glasgow, UK)



5 November - speaker to be announced

12 November - speaker to be announced

19 November - speaker to be announced

26 November - speaker to be announced


3 December

Giulia Saccà (Collège de France and Columbia University, USA): TBA


10 December - speaker to be announced

Previous seminars:

May 14

Hipolito Treffinger (University of Leicester)

Representation theoretic aspects of scattering diagrams


May 21

Alex Takeda (IHES, France)

Gluing relative stability conditions along pushouts


May 28

Bernhard Keller (Université Paris Diderot - Paris 7, France)

Grassmannian braiding categorified


4 June

Balazs Szendroi (University of Oxford, UK)

Title: Hilbert schemes of points on singular surfaces: combinatorics, geometry, and representation theory


11 June

Qiu Yu (Tsinghua University Beijing, China)

Title: Graded decorated marked surfaces: Calabi-Yau-X categories of gentle algebras


18 June

Lara Bossinger (Instituto de Matemáticas UNAM Unidad, Mexico)

Title: Families of Gröbner degenerations


25 June

Wendy Lowen  (University of Antwerp, Belgium)

Title: linear quasi-categories as templicial modules (joint work with Arne Mertens)


2 July

Hiraku Nakajima (Kavli IPMU, Tokyo, Japan)

Title: Euler numbers of Hilbert schemes of points on simple surface singularities and quantum dimensions of standard modules of quantum affine algebras


9 July

Alexander Polishchuk (University of Oregon, USA)

Title: Geometry of the Associative Yang-Baxter equation


16 July

Markus Reineke (Universität Bochum, Germany)

Title: Fano quiver moduli


23 July

Laura Schaposnik (University of Illinois at Chicago, USA)

Title: On Generalized Hyperpolygons


03 September

Andrea Solotar (Buenos Aires, Argentina)

A cup-cap duality in Koszul calculus


10 September

Zhengfang Wang(Stuttgart, Germany)

Deformations of path algebras of quivers with relations


17 September

No Seminar: Categorifications in Representation Theory Conference at Leicester


24 September

Ailsa Keating (Cambridge, UK)

Homological mirror symmetry for log Calabi-Yau surfaces


01 October

Karin Baur (Leeds, UK and Graz, Austria)

Structure of Grassmannian cluster categories


8 October

Andrey Lazarev (Lancaster, UK)

Koszul duality for dg-categories and infinity-categories (joint with J. Holstein)


15 October

Fabrizio Catanese (Bayreuth, Germany)

Topologically trivial automorphisms of compact Kähler surfaces and manifolds

Abstract: The abstract can be downloaded here.


Zoom is the online platform being used to deliver this seminar series.

This seminar series is supported as part of the ICMS Online Mathematical Sciences Seminars.