Centre for Mathematics, University of Coimbra

Seminars

Marcinkiewicz exponent and boundary value problems for iterated Cauchy-Riemann and Dirac operators in fractal domains

2025-11-04

Speaker: Carlos Daniel Tamayo Castro (Instituto Politécnico Nacional, Mexico)

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Connections on vector bundles: comparison of definitions, and examples

2025-11-04

Speaker: Pedro Pessoa (CMUC, UC|UP PhD student)

We will focus on different definitions of connections on vector bundles (covariant derivatives, horizontal distributions), and examples (namely Levi-Civita connections)....

The challenges of predatory journals and paper mills in mathematics: A glimpse at the parallel universe of fake science

2025-11-17

Speaker: Ilka Agricola (Chair of the Committee on Electronic Information and Communication of the IMU, Philipps-Universität Marburg, Germany)

14:30, Special Colloquium on Fraudulent Publishing in Mathematical Sciences moderated by Jorge Buescu (EMS Vice-President, University of Lisbon, Portugal) Abstract: In November 2023, Clarivate Plc announced that it had excluded the entire field of mathematics from the most recent edition...

Terminal coalgebras in graduated categories

2025-11-20

Speaker: Jirí Adámek (Czech Technical Univ., Prague, Czech Republic)

Graduated categories were introduced in [1] in order to prove that finitary endofunctors are right adjoints iff they preserve countable limits. Recently, these categories turned out to be useful in categorical colagebra: every finitary endofunctor preserving finite intersections has a...

Fractional order Orlicz Sobolev spaces

2025-11-21

Speaker: Amiran Gogatishvili (Czech Academy of Sciences, Prague)

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2025-12-02

Speaker: Nadja Egner (UCLouvain, Belgium)

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2025-12-02

Speaker: Tom Leinster (The University of Edinburgh, Scotland)

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On extremal properties of Laplace transform and non uniqueness solutions of the heat equation

2025-12-11

Speaker: João Fontinha (Univ. Lisbon, Portugal)

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Linear chaos - from an apparent paradox to an ubiquitous phenomenon

2025-12-15

Speaker: Karl Grosse-Erdmann (Université de Mons, Belgium)

An AI-enhanced search via google reveals that "Chaos is a nonlinear phenomenon because it describes how complex, often unpredictable, behavior arises from simple deterministic rules in a system." In this talk we illustrate each part of this statement - with one exception: a system need not...

On the commuting tensor product of symmetric multicategories and their bimodules

2026-01-13

Speaker: Nicola Gambino (University of Manchester, UK )

We provide a unified treatment of several commuting tensor products considered in the literature, including the tensor product of enriched categories and the Boardman-Vogt tensor product of symmetric multicategories, subsuming work of Elmendorf and Mandell. We then show how a commuting...

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2026-01-13

Speaker: Geoffrey Cruttwell (Mount Allison University, Canada)

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The ODE/IM correspondence for the quantum KdV model

2026-01-20

Speaker: Gabriele Degano (Univ. Lisbon, Portugal)

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Free boundary regularity for the obstacle problem

2026-01-20

Speaker: Alessio Figalli (Fields Medal, ETH Zurich, Switzerland)

The classical obstacle problem consists of finding the equilibrium position of an elastic membrane whose boundary is held fixed and constrained to lie above a given obstacle. By classical results of Caffarelli, the free boundary is smooth outside a set of singular points. However, explicit...

The dynamics of viscous vortex filaments and the binormal curvature flow

2026-02-02

Speaker: Luis Vega (UPV/EHU & BCAM, Spain)

I'll present some recent work about the connection of vortex filaments/tubes that move according to Navier Stokes Equation and the binormal curvature flow of curves in 3d. This is a joint work with Mikel Ispizua and Marco A. Fontelos....

Degenerate versions of hypergeometric Bernoulli and Euler polynomials

2026-02-25

Speaker: Yamilet Quintana (Universidad Carlos III de Madrid, Spain)

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The Value of Errors in Proofs (a fascinating journey from Turing's 1936 R \(\neq\) RE to the 2020 breakthrough of MIP* = RE)

2026-03-01

Speaker: Avi Wigderson (Abel Prize, Turing Award, IMU Abacus Medal, Institute for Advanced Study, Princeton Univ., USA)

In 2020, a group of theoretical computer scientists posted a paper on the Arxiv with the strange-looking title "MIP* = RE", impacting and surprising not only computational complexity theory but also some areas of math and physics. Specifically, it resolved, in the negative, the "Connes'...

Yet another characterization of discrete classical orthogonal polynomials on linear lattices?

2026-03-12

Speaker: Guillermo Gordillo-Núñez (CMUC, University of Coimbra)

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Partial regularity in nonlocal problems

2026-04-16

Speaker: Giuseppe Mingione (Università di Parma, Italy)

The theory of partial regular regularity for elliptic systems replaces the classical De Giorgi-Nash-Moser one for scalar equations asserting that solutions are regular outside a negligible closed subset called the singular set. Eventually, Hausdorff dimension estimates on such a set can be...