Centre for Mathematics, University of Coimbra

Seminars

Quasi-orthogonal polynomials and positive quadrature on the unit circle

2025-09-18

Speaker: Ruymán Cruz Barroso (University of La Laguna, Spain)

The concept of quasi-orthogonality was introduced in 1923 by M. Riesz in connection with moment problems, and then by L. Fejér and J.A. Shohat in 1933 and 1937 respectively, in the context or quadrature formulas.It is very well known that the polynomials that play a similar role on the unit...

The quantum group \(SL_2\) at infinite curvature, Kashiwara crystals and Pitman's 2M-X Theorem in probability

2025-09-19

Speaker: Reda Chhaibi (Université Côte d'Azur, Nice, France)

Pitman's theorem states that a Brownian motion minus twice its current minimum is a Markov process. We will focus on two seemingly distinct approaches to this theorem: (1) Biane's approach, which uses a non-commutative random walk on the quantum group deforming \( SL_2 \) in the crystal...

Nonstandard weights and applications

2025-09-26

Speaker: Alexandre Almeida (Univ. Aveiro)

In this talk, we discuss some results on power weights with nonstandard growth, including their connection within generalized Muckenhoupt classes. Moreover, we consider some related new variable exponent function spaces and discuss the role of uniform weighted norm inequalities in the study...

On the Hopf \(U_{p,q}({\rm su}_2)\) algebra and special functions

2025-10-06

Speaker: Vivek Sahai (Lucknow Univ., India)

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2025-10-07

Speaker: James Gray (Stellenbosch Univ., South Africa)

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Noncommutative Poisson structure and invariants of matrices

2025-10-07

Speaker: Xabier García-Martínez (Univ. de Santiago de Compostela, Spain)

In this talk we will explain how we used methods coming from non-associative algebras and from computational algebra to obtain the full description of the ring of invariants of pairs of \( 4\times 4 \) matrices, which could not be solved using the standard representation theory methods....

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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Special Colloquium on Fraudulent Publishing in Mathematical Sciences

2025-11-17

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

TBA moderated by Jorge Buescu (EMS Vice-President, University of Lisbon, Portugal)...

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...

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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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2025-12-15

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

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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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Degenerate versions of hypergeometric Bernoulli and Euler polynomials

2026-02-25

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

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