Centre for Mathematics, University of Coimbra

Seminars

Incorporating symplectic groupoid multiplication into Poisson integrator methods

2026-06-24

Speaker: Alejandro Cabrera (Uni. Politècnica de Catalunya, Spain)

This talk is based on recent joint work with D. Iglesias and J.C. Marrero. Following O. Cosserat, we first review a general approach to approximate hamiltonian flows in a Poisson manifold. Only the "strict bi-realization" data is used in these approaches, but not the underlying groupoid...

Polaroids

2026-06-24

Speaker: Rui Loja Fernandes (Univ. of Illinois Urbana-Champaign, USA)

How can one simplify a general group action by replacing it with a regular group action, that is, one whose orbits all have the same dimension? In this lecture, I will discuss this problem for proper Lie group actions, as well as its generalization to proper Lie groupoids. I will review some...

Sheaves on spectral spaces and the patch monad

2026-06-26

Speaker: Mai Gehrke (Université Côte d'Azur, Nice, France)

A presheaf over a meet semilattice gives rise, via a construction introduced by Grothendieck, to a simple algebraic structure: it is based on the local sections and is equipped with the operation sometimes called restriction: given local sections \( s \) and \( t \), the restriction of \( t...

Compact metric spaces as exponentiable metric compact Hausdorff spaces

2026-06-26

Speaker: Dirk Hofmann (CIDMA, Univ. Aveiro)

See attached file....

Fitness and subfitness via interior and closure operators

2026-06-26

Speaker: João Areias

We start by rephrasing some well-known characterizations of fit and subfit locales in terms of closure and interior operators on the system of sublocales. Using these characterizations, we are able to extend the notions of fitness and subfitness to a more general setting. This approach not...

TBA

2026-09-28

Speaker: Peter Gothen (Univ. of Porto)

TBA...

From phase separation in heterogeneous media to learning training schemes for image denoising

2026-10-29

Speaker: Irene Fonseca (Carnegie Mellon University, USA)

What do these two themes have in common? Both are treated variationally, both deal with energies of different dimensionalities, concepts of geometric measure theory prevail in both, and higher order penalizations are considered. Will learning training schemes for choosing these...

Special Colloquium on Gender Equity, Feminist Activism, and Civil Rights in Mathematics

2027-02-04

Speaker: Sarah J. Greenwald (Appalachian State University, USA)

Two-talk session: 14:30 - 15:30 Special Colloquium on Gender Equity, Feminist Activism, and Civil Rights in Mathematics The Association for Women in Mathematics: Why It Was Founded, Why It's Still Needed, and What Students and Faculty Can Do Today Abstract: Founded in 1971 during a surge...

Financiado total ou parcialmente pela FCT, Fundação para a Ciência e a Tecnologia, I.P., sob o Financiamento de:
UID/00324/2025 Projeto Estratégico com a referência DOI https://doi.org/10.54499/UID/00324/2025.
https://doi.org/10.54499/UID/PRR/00324/2025 UID/PRR/00324/2025 https://doi.org/10.54499/UID/PRR2/00324/2025 UID/PRR2/00324/2025
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