## NumPI seminars 2023-204

### Spring 2024

- 6/02/2024, 10:00
**Dario Fasino**, Università di Udine

Is there a Kemeny’s constant for second-order random walks?

Questo seminario si terrà presso l’Aula Magna del Dipartimento di Matematica - 13/02/2024, 15:00
**Stefano Pozza**, Charles University – Univerzita Karlova

How to express the solution of an ODE as a linear system (in a suitable algebra) and exploit it for fast computation.

Questo seminario si terrà presso l’Aula Mancini della Scuola Normale Superiore - 11/04/2024, 16:00
**Ivan Bioli**, École Polytechnique Fédérale de Lausanne

Preconditioned Low-Rank Riemannian Optimization for Multiterm Linear Matrix Equations

Questo seminario si terrà presso l’Aula Seminari del Dipartimento di Matematica - 24/05/2024, 16:00
**Dierk Schleicher**, Aix-Marseille Université

The Weierstrass and Ehrlich-Aberth root finders as dynamical systems

Questo seminario si terrà presso l’Aula Seminari del Dipartimento di Matematica - 13/06/2024, 11.00
**Taejun Park**, University of Oxford

A low-rank approximation of parameter-dependent matrices via CUR decomposition

Questo seminario si terrà presso l’Aula Riunioni del Dipartimento di Matematica

## Past years

### NumPI seminars 2022-2023

#### Spring 2023

The seminars will be held either in the **Aula Magna** or in the **Aula Seminari** at the **Department of Mathematics**.

- 21/02/2023, 11:00
**Prof. Lloyd N. Trefethen**, University of Oxford, UK

Applications of AAA Rational Approximation

Questo seminario si terrà presso l’Aula Volterra della Normale - 28/03/2023, 16:00
**Cecilia Pagliantini**, Università di Pisa,

Model order reduction of parametric Hamiltonian systems on matrix manifolds

Aula Seminari - 13/04/2023, 11:00
**Raf Vandebril**, KU Leuven

Perfect Shifted QR for Rank Structured Pencils

Aula Riunioni - 19/05/2023, 15:00
**Federica Pes**, Università di Pisa,

Grassmann extrapolation of density matrices as a tool to accelerate Born-Oppenheimer molecular dynamics

Aula Riunioni - 30/05/2023, 16:00
**Michele Rinelli**, Scuola Normale Superiore

Stochastic probing methods for estimating the trace of functions of sparse symmetric matrices

Aula Riunioni - 05/06/2023, 16:00
**Luca Saluzzi**, Scuola Normale Superiore

A Tensor Gradient Cross for Hamilton-Jacobi-Bellman equations

Aula Seminari - 18/07/2023, 14:00
**Lu Xia**, Eindhoven University of Technology (TU/e)

On the influence of stochastic rounding bias in implementing gradient descent with applications in low-precision training

Aula Magna

#### Fall 2022

The seminars will be held either in the **Aula Magna** or in the **Aula Seminari** at the **Department of Mathematics**. We will keep streaming the seminars live using the BigBlueButton system of the Department of Mathematics. Please visit https://metings.dm.unipi.it/b/leo-xik-xu4 to join a seminar remotely.

- 15/12/2022, 11:00
**Gianluca Ceruti**, EPFL, Switzerland,*Robust numerical integrators for dynamical low-rank approximation* - 10/11/2022, 11:00
**Aaron Melman**, Santa Clara University, USA,

Recent extensions of scalar and matrix polynomial properties and their interactions - 24/10/2022, 16:00
**Santolo Leveque**, Scuola Normale Superiore,

A “matching strategy” for optimal control problems with PDEs as constraints - 26/09/2022, 16:15
**Anna Weller**, University of Cologne

A spectral Galerkin method for the solution of reaction-diffusion equations on metric graphs

Questo seminario si terrà presso l’Aula Volterra della Normale

### NumPI seminars 2021-2022

#### Spring 2022

The seminars will be held either in the **Aula Magna** or in the **Aula Seminari** at the **Department of Mathematics**. We will keep streaming the seminars live using the BigBlueButton system of the Department of Mathematics. Please visit https://metings.dm.unipi.it/b/leo-xik-xu4 to join a seminar remotely.

- 13/04/2022, 11:00
**Raf Vandebril**, Department of Computer Science, KU Leuven,

Construction of a sequence of orthogonal rational functions - 18/03/2022, 11:00
**Filippo Lipparini**, Dipartimento di Chimica, UniPI,

Grassmann extrapolation for Born-Oppenheimer Molecular Dynamics - 07/03/2022, 11:15
**Nicola Guglielmi**, Gran Sasso Science Institute,

Eigenvalue optimization via low-rank ODEs.

This seminar will be held in the**Aula Volterra**on the third floor of the**Palazzo della Carovana**, Scuola Normale Superiore.

Il seminario si terrà in presenza. Chi fosse interessato a partecipare deve**scrivere**a mailto:classi@sns.it**entro le 9:00 di Lunedì 7 marzo 2022**. - 24/02/2022, 11.00
**Leonardo Robol**, Università di Pisa,

Sampling the eigenvalues of random matrices. - 10/02/2022, 11.00
**Milo Viviani**, Scuola Normale Superiore,

Solving cubic matrix equations arising in conservative dynamics.

#### Fall 2021

The seminars will be held either in the **Aula Magna** or in the **Aula Seminari** at the **Department of Mathematics**. We will keep streaming the seminars live using the BigBlueButton system of the Department of Mathematics. Please visit https://hausdorff.dm.unipi.it/b/leo-xik-xu4 to join a seminar remotely.

- 06/12/2021, 15:00
**Bruno Iannazzo**, Università degli Studi di Perugia,

New geometries on positive-definite matrices and their relation to the power means - 19/11/2021, 10:00
**Mariarosa Mazza**, Università dell’Insubria,

Caputo and Riemann-Liouville fractional derivatives: a matrix comparison. - 25/10/2021, 15:00
**Cecilia Pagliantini**, TU Eindhoven,

Structure-preserving dynamical model order reduction of parametric Hamiltonian systems, video. - 15/10/2021, 16:30
**Igor Simunec**, Scuola Normale Superiore,

Computation of generalized matrix functions with rational Krylov methods, video.

If you wish to attend in person, please fill in this form:

### NumPI seminars 2020-2021

#### Spring 2021

Due to the COVID-19 pandemic, the seminars will be run online using the BigBlueButton system of the Department of Mathematics. Please visit https://hausdorff.dm.unipi.it/b/leo-xik-xu4 to join a seminar.

- 18/06/2021, 16:00
**Stefano Cipolla**, University of Edinburgh

Random multi-block ADMM: an ALM based view for the QP case – video. - 04/06/2021, 15:00
**Margherita Porcelli**, Università di Bologna

Relaxed Interior point methods for low-rank semidefinite programming problems – video. - 14/05/2021, 16:00
**Alfredo Buttari**, CNRS, IRIT, Toulouse

Reducing the complexity of linear systems solvers through the block low-rank format – video. - 07/05/2021, 16:00
**Stefano Pozza**, Charles University,

The Short-term Rational Lanczos Method and Applications – video. - 23/04/2021, 16:00
**Philipp Birken**, Lunds Universitet,

Conservative iterative solvers in computational fluid dynamics – video - 09/04/2021, 16:00:
**Jie Meng**, University of Pisa,

Geometric means of quasi-Toeplitz matrices – video. - 19/03/2021, 16:00:
**Alice Cortinovis**, EPFL,

Randomized trace estimates for indefinite matrices with an application to determinants – video. - 05/03/2021, 16:00:
**Davide Bianchi**, University of Insubria,

Compatibility, embedding and regularization of non-local random walks on graphs – video

##### Fall 2020

Due to the COVID-19 pandemic, the seminars will be run online using the BigBlueButton system of the Department of Mathematics. Please visit https://hausdorff.dm.unipi.it/b/leo-xik-xu4 to join a seminar.

- 30/11/2020, 16:00:
**Fabio Durastante**, IAC-CNR,

(Sparse) Linear Algebra at the Extreme Scales – Video - 17/11/2020, 11:00:
**Francesco Tudisco**, GSSI,

A tensor method for semi-supervised learning – Video - 03/11/2020, 11:00:
**Angelo Casulli**, Scuola Normale Superiore,

Rank-structured QR for Chebyshev rootfinding – Video - 20/10/2020, 11.00:
**Simon Telen**, MPI Leipzig,

Solving Polynomial Systems via Truncated Normal Forms. - 06/10/2020, 11.00:
**Milo Viviani**, Scuola Normale Superiore,

Symplectic methods for isospectral flows and 2D ideal hydrodynamics.

### NumPI seminars 2019-2020

#### Spring 2020

- 04/03/2020:
**Daniel Szyld**, Temple University

Efficient iterative methods for the solution of Generalized Lyapunov Equations: Block vs. point Krylov projections, and other controversial decisions. - 29/01/2020:
**Simona Perotto**, Politecnico di Milano,

Topology Optimization: a new algorithm based on anisotropic mesh adaptation. - 20/01/2020:
**Fernando De Terán**, Universidad Carlos III de Madrid, Spain

Flanders’ theorem for many matrices under commutativity assumptions.

#### Fall 2019

- 11/12/2019:
**Vanni Noferini**, Aalto University, Finland,

Wilkinson’s bus: weak condition numbers, with applications. - 04/12/2019:
**Stefano Massei**, EPFL, Lausanne, Switzerland,

Rational Krylov for Stieltjes matrix functions: convergence and pole selection. - 27/11/2019:
**Gerald Williams**, University of Essex, UK,

The role of circulant matrices in the study of cyclically presented groups - 20/11/2019:
**Enrico Facca**, Scuola Normale Superiore, Pisa,

A bio-inspired optimization tool, the Dynamic Monge-Kantorovich model. Numerical solutions and applications - 13/11/2019:
**Massimiliano Fasi**, Department of Mathematics, The University of Manchester

Handling the conditioning of extreme-scale matrices

### NumPI seminars 2018-2019

Here you find a list of the seminars scheduled for the academic year 2018-2019.

#### Spring 2019

- 04/07/2019:
**Federico Poloni**, Università di Pisa

Principal Pivot Transforms, quasidefinite matrices, and matrix equations - 25/06/2019:
**Michael L. Overton**, Courant Institute of Mathematical Sciences, New York University

Crouzeix Conjecture - 05/06/2019:
**Leonardo Robol**, Università di Pisa,

Rank structures in matrix equations and matrix functions - 12/04/2019:
**James Nagy**, Department of Mathematics, Emory University

MATLAB Tools for Large-Scale Linear Inverse Problems - 11/04/2019:
**Fabio Carrara**, ISTI-CNR,

Neural networks for image understanding: methods, limitations, and new frontiers - 04/04/2019:
**Peter Benner**, Max Planck Institute for Dynamics of Complex Technical Systems

Low-rank tensor methods for PDE-constrained optimization under uncertainty. - 08/04/2019:
**Raf Vandebril**, Department of Computer Science, KU Leuven

Structures, Gramians, and Krylov - 25/03/2019:
**Vanni Noferini**, University of Essex and Aalto University

Matrices in companion rings and their Smith forms, with applications to group theory and algebraic topology - 21/03/2019:
**Vladimir Druskin**, Worcester Polytechnic Institute

Embedding properties of network realizations of reduced order models with applications to inverse scattering and data science - 18/03/2019:
**Carla Hernando**, UC3M, Spain

Sparse linearizations and (sparse) structured ell-ifications - 14/03/2019:
**Michiel Hochstenbach**, TU Eindhoven, Netherlands

Solving polynomial systems by determinantal representations - 28/02/2019:
**Fabio Durastante**, University of Pisa

The Krylov–Jacobi method: functions of matrices for fractional partial differential equations - 09/01/2019:
**Daniel Kressner**, EPFL, Switzerland

Tensorized Krylov subspace methods: Algorithms, analysis, and applications

#### Fall 2018

- 13/12/2018:
**Giulio Masetti**, University of Pisa

Computing dependability-oriented measures on Markov chains by means of matrix functions - 06/12/2018:
**Stefano Massei**, EPFL, Switzerland

A low-rank technique for computing the quasi stationary distribution of Galton-Watson processes - 27/11/2018:
**Marcus Carlsson**, Lund University, Sweden

Perturbation theory for the spectral decomposition of matrices - 22/11/2018:
**Jie Meng**, Pusan National University, South Korea

On the positive definite solution of the nonlinear matrix equation X^p=A+M^T(X#B)M - 15/11/2018:
**Giovanni Barbarino**, Scuola Normale Superiore, Pisa

Higher order spectral symbols and eigenvalues approximation for Toeplitz matrices