Seminars
2025-05-09
Speaker: Telma Silva (Univ. Cabo Verde)
Several diseases such as inflammation (e.g. chronic intestinal inflammation and chronic inflammatory disease in cardiovascular system), infections (e.g. infection of airway epithelium, human papillomavirus (HPV) infection and foot-and-mouth disease), acute lung injury, allergies and cancer...
Describing good objects in categories with weak algebraic properties
2025-05-13
Speaker: Andrea Montoli (Univ. degli Studi di Milano, Italy)
With the initial motivation of looking for a categorical characterization of groups among monoids, we introduced some conditions on objects in general categories, describing good algebraic properties holding locally for these objects although not globally in the category. These conditions,...
Generalized conjugacy separability in extensions of groups
2025-05-13
Speaker: André Carvalho (CMUP, Univ. Porto)
Separability properties in groups can be seen as an algebraic analogue of classical decision problems in finitely presented groups, as an argument by Mal'cev shows that if a subset S of a finitely presented group is recursively enumerable, separable and its image under a surjective...
Maintenance modelling and inference in a Wiener degradation model considering different observation schemes
2025-05-16
Speaker: María Lúcia Bárcena (Univ. Extremadura, Spain)
Industrial systems normally present interrelated parts that influence the system performance. For instance, lighting systems composed of many LED lamps, which present a likely dependence because of their common usage. Maintenance actions are performed on these systems to mitigate the...
Normed categories
2025-05-20
Speaker: Walter Tholen (York Univ., Toronto, Canada)
In this talk we explore Lawvere's notion of normed category through the lens of easily understood small and large example categories. Cauchy convergence of sequences in such categories gets presented as a natural extension of familiar concepts taught in Calculus and Functional Analysis, but...
Self-dual aspects of semi-abelian categories
2025-05-20
Speaker: Tim Van der Linden (Univ. catholique de Louvain and Vrije Univ. Brussel, Belgium)
The aim of this talk is to introduce di-exact categories [3], which are defined by a simple axiom system capturing self-dual aspects of the context of Janelidze-Márki-Tholen semi-abelian categories [2,1]. A Borceux-Bourn homological category [1] is Barr-exact if and only if it is di-exact....
Fractal behavior of tensor powers of the two-dimensional space in prime characteristic
2025-05-22
Speaker: Pavel Etingof (MIT, Cambridge, USA)
TBA...
Polynomials whose roots are the differences of the roots of a given polynomial
2025-06-03
Speaker: Manuel A. Facas Vicente/José Vitória (DMUC, Univ. Coimbra)
TBA...
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2025-06-17
Speaker: Alfredo Costa (CMUC, Univ. Coimbra)
TBA...
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2025-06-17
Speaker: Célia Borlido (CMUC, Univ. Coimbra)
TBA...
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2025-06-24
Speaker: Semyon Yakubovich (Univ. Porto)
TBA...
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2025-06-25
Speaker: Mateus Moreira de Melo (Univ. Fed. Espírito Santo, Brazil)
TBA...
Classifying cubic graphs avoiding spectral gap sets
2025-06-25
Speaker: Gordon Royle (Univ. Western Australia, Australia)
Spectral graph theory is the study of the relationship between the graphical properties of a graph and the spectral properties (i.e., eigenvalues and eigenvectors) of various matrices associated with that graph, most commonly the adjacency matrix. The spectrum of the...
Large random tilings of a hexagon
2025-09-15
Speaker: Arno Kuijlaars (KU Leuven, Belgium)
TBA...
Quasi-orthogonal polynomials and positive quadrature on the unit circle
2025-09-18
Speaker: Ruymán Cruz Barroso (University of La Laguna, Spain)
TBA...
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