**IMPANGA** is an algebraic geometry seminar created at IMPAN in 2000 by Piotr Pragacz. It is currently organized by Piotr Achinger, Jarosław Buczyński, and Michał Kapustka, with Piotr Pragacz as Honorary Chairman.

In the academic year 2021/22, IMPANGA meets twice per month for a one day session on **Friday**, with two 60 min talks separated by a lunch break:

I. 10:30-11:30

II. 13:00-14:00

The seminar meets in **Room 6 at IMPAN** (unless stated otherwise). Sometimes we meet online or in hybrid mode via Zoom. Please email one of the organizers for the Zoom link.

See here for information on former meetings of IMPANGA

## Meetings during the 2021/22 term

### October 8 (impanga 423): special meeting in honor of Piotr Pragacz

#### Flag Bundles, Segre Polynomials and Push-Forwards

**Speaker:**Lionel Darondeau (IMJ-PRG, Sorbonne Université)

**Reception/lunch**in room

**409**

**Wine and cheese**in room

**409**

### October 22 (impanga 424)

**403**)

#### Semistable modules over Lie algebroids

**Speaker:**Adrian Langer (MIMUW)

#### Serre-invariant stability conditions and cubic threefolds

**Speaker:**Laura Pertusi (Milan)

### November 5 (impanga 425)

#### Rationality under specialization

**Speaker:**Andrew Kresch (Universität Zürich)

#### Almost minimal model program for log surfaces

**Speaker:**Karol Palka (IMPAN)

### November 19 (impanga 426), moved online

#### Algebraic geometry of commuting matrices

**Speaker:**Joachim Jelisiejew (MIMUW)

### December 3 (impanga 427), online

#### Irregular Hodge theory: Applications to arithmetic and mirror symmetry

**Speaker:**Claude Sabbah (École Polytechnique)

### December 17 (impanga 428), hybrid

**hybrid format**. The first talk will take place in Room 6 at IMPAN and will be broadcast online via Zoom. The second speaker will connect via Zoom and the participants will gather in Room 6. Please email the organizers for the Zoom link if you wish to participate remotely.

#### Zariski multiplicity conjecture via Floer homology

**Speaker:**Tomasz Pełka (Basque Center for Applied Mathematics)

### January 14 (impanga 429)

#### Classification of algebraic varieties in positive and mixed characteristic

**Speaker:**Jakub Witaszek (University of Michigan)

#### On the strength of homogeneous polynomials

**Speaker:**Alessandro Oneto (Università di Trento)

### January 28 (impanga 430), hybrid

#### On $p$-adic étale cohomology of $p$-adic analytic spaces

**Speaker:**Wiesława Nizioł (CNRS, Sorbonne)

#### Fixed-point loci in the Hilbert schemes of points in the plane

**Speaker:**Jørgen Vold Rennemo (University of Oslo)

### March 4 (impanga 431), hybrid

#### Identifiability of pairs of polynomials

**Speaker:**Francesco Galuppi (IMPAN)

#### On the existence of minimal models for generalized pairs

**Speaker:**Nikolaos Tsakanikas (Universität des Saarlandes)

### March 18 (impanga 432)

#### $p$-adic non-abelian Hodge theory and the pro-étale site

**Speaker:**Ben Heuer (Universität Bonn)

#### The linear span of uniform matrix product states

**Speaker:**Tim Seynnaeve (Universität Bern)

### April 8 (impanga 433)

#### On Separable $\mathbf{A}^2$ and $\mathbf{A}^3$-forms

**Speaker:**Neena Gupta (Indian Statistical Institute, Kolkata)

#### On stable surfaces of general type with small invariants

**Speaker:**Stephen Coughlan (Universität Bayreuth)

### April 22 (impanga 434)

#### Schubert calculus: from classical via $K$-theory to elliptic classes

**Speaker:**Andrzej Weber (Uniwersytet Warszawski)

#### Variation of stable birational type and bounds for complete intersections

**Speaker:**Johannes Nicaise (Imperial College London and KU Leuven)

### May 6 (impanga 435)

#### On the unirationality of quadric bundles

**Speaker:**Alex Massarenti (Università di Ferrara)

#### \(\mathbb{C}^*\) actions and birational geometry

**Speaker:**Jarosław Wiśniewski (Uniwersytet Warszawski)