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See detailPresentation of work in social network analysis
During, Marten UL

Presentation (2018)

Detailed reference viewed: 86 (3 UL)
See detailPresentation: Borderland Studies Meets Child Studies. A European Encounter.
Venken, Machteld UL

Scientific Conference (2017, April)

Detailed reference viewed: 13 (0 UL)
See detailPresentation: Children in 20th Century European Borderlands
Venken, Machteld UL

Presentation (2016, June 13)

Detailed reference viewed: 12 (0 UL)
See detailPresentation: Citizen Science - Ist das Wissenschaft?
Jaschik, Johanna Maria UL

Presentation (2021, April 29)

Detailed reference viewed: 61 (3 UL)
See detailPresentation: Elite Training in Interwar Europe. A Perspective from the Border
Venken, Machteld UL

Presentation (2015, January)

Detailed reference viewed: 10 (0 UL)
See detailPresentation: Historia mówiona w powiecie lublinieckim (województwo katowickie)
Venken, Machteld UL; Kaczorowski, Grzegorz

Presentation (2014, July 05)

Detailed reference viewed: 11 (1 UL)
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See detailPresentations of groups acting discontinuously on direct products of hyperbolic spaces
Jespers, E.; Kiefer, Ann UL; del Río, Á.

in Mathematics of Computation (2016), 85(301), 2515--2552

The problem of describing the group of units U(ZG) of the integral group ring ZG of a finite group G has attracted a lot of attention and providing presentations for such groups is a fundamental problem ... [more ▼]

The problem of describing the group of units U(ZG) of the integral group ring ZG of a finite group G has attracted a lot of attention and providing presentations for such groups is a fundamental problem. Within the context of orders, a central problem is to describe a presentation of the unit group of an order O in the simple epimorphic images A of the rational group algebra QG. Making use of the presentation part of Poincaré’s Polyhedron Theorem, Pita, del Río and Ruiz proposed such a method for a large family of finite groups G and consequently Jespers, Pita, del Río, Ruiz and Zalesskii described the structure of U(ZG) for a large family of finite groups G. In order to handle many more groups, one would like to extend Poincaré’s Method to discontinuous subgroups of the group of isometries of a direct product of hyperbolic spaces. If the algebra A has degree 2 then via the Galois embeddings of the centre of the algebra A one considers the group of reduced norm one elements of the order O as such a group and thus one would obtain a solution to the mentioned problem. This would provide presentations of the unit group of orders in the simple components of degree 2 of QG and in particular describe the unit group of ZG for every group G with irreducible character degrees less than or equal to 2. The aim of this paper is to initiate this approach by executing this method on the Hilbert modular group, i.e. the projective linear group of degree two over the ring of integers in a real quadratic extension of the rationals. This group acts discontinuously on a direct product of two hyperbolic spaces of dimension two. The fundamental domain constructed is an analogue of the Ford domain of a Fuchsian or a Kleinian group. [less ▲]

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See detailO presente fugidio das crises constitucionais: uma interrogação acerca da questão concernindo a Modernidade da Constituição
Spindola Diniz, Ricardo UL

in Revista Direito e Práxis (2021)

Constitutional crises are denounced now and then. Even if one notices a decrease in the capacity of this concept to ignite popular mobilization, as there seems to be fewer persons inclined to go to the ... [more ▼]

Constitutional crises are denounced now and then. Even if one notices a decrease in the capacity of this concept to ignite popular mobilization, as there seems to be fewer persons inclined to go to the streets in defense of the Constitution in crisis, the concept of crisis retains, unquestionably, its importance, both rhetorically and historiographically. Nevertheless, a theory of constitutional crises remains absent. The present article proposes to confront this absence, interrogating the literature dedicated to the concept of constitutional crises, on the one hand, and questioning the meaning of this absence in its connection to the concept of the Constitution itself. [less ▲]

Detailed reference viewed: 41 (4 UL)
See detailPresenter: BE/LU/DE/FR Borderlands and Veterans after the First World War
Venken, Machteld UL

Presentation (2021, November 30)

Detailed reference viewed: 17 (1 UL)