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Applications of Frobenius algebras to representation theory of schur algebras
Description :
A Schur algebra is a subalgebra of the group algebra RG associated to a partition of G, where G is a finite group and R is a commutative ring. For two classes of Schur algebras we study the relationship between indecomposable modules over the Schur algebra and over RG, but we discuss this problem in...
Repository :
Document Server@UHasselt
Language(s) :
English
Semigroups of I-type
Description :
Assume that S is a semigroup generated by {x(1),..., x(n)}, and let U be the multiplicative free commutative semigroup generated by {u(1),..., u(n)}. We say that S is of I-type if there is a bijective upsilon : U --> S such that for all a is an element of U, {upsilon(u(1)a),..., upsilon(u(n)a)} = {x...
Repository :
Document Server@UHasselt
Language(s) :
English
Generalized 2-cocycles of finite groups and maximal orders
Author(s) :
NAUWELAERTS, Erna
Description :
Let R be a Dedekind domain with quotient field K and let G be a finite group. Let alpha: G x G --> R \ {0} be a generalized 2-cocycle, i.e., not necessarily taking its values in the units of R, and consider the generalized twisted group ring R *(alpha) G. In this paper we derive criteria for R *(alp...
Repository :
Document Server@UHasselt
Language(s) :
English
Quadratic Lienard equations with quadratic damping
Description :
In this paper we study the generalized Lienard equations (x) double over dot + f(x) (x) overdot + g(x) = 0 with quadratic polynomials f and g. We prove that these kind of equations can have at most one limit cycle, and we give the complete bifurcation diagram and classification of the phase portrait...
Repository :
Document Server@UHasselt
Language(s) :
English
Perturbations from an elliptic Hamiltonian of degree four - II. Cuspidal loop
Description :
The paper deals with Lienard equations of the form x = y, y = P(x) + yQ(x) with P and Q polynomials of degree respectively 3 and 2. Attention goes to perturbations of the Hamiltonian vector field with an elliptic Hamiltonian of degree 4, exhibiting a cuspidal loop. It is proven that the least upper ...
Repository :
Document Server@UHasselt
Language(s) :
English
Attribute grammars for unranked trees as a query language for structured documents
Author(s) :
NEVEN, Frank
Description :
Document specification languages, like for instance XML, model documents using extended context-free grammars. These differ from standard context-free grammars in that they allow arbitrary regular expressions on the fight-hand side of productions. To query such documents, we introduce a new form of ...
Repository :
Document Server@UHasselt
Language(s) :
English
Orbital ordering and the cooperative Jahn-Teller effect in single crystals of the magnetic Perovskite La7/8Sr1/8MnO3
Author(s) :
WAGNER, Patrick
,
Gordon, I.
,
Moshchalkov, V.V.
,
Bruynseraede, Y.
,
Pinsard, L.
,
Revcolevschi, A.
Description :
In the low-doped magnetic perovskite La7/8Sr1/8MnO3, a strong coupling exists between crystal structure and magnetic and electronic properties. At room temperature, the material is in a paramagnetic-semiconducting state, showing a dynamic Jahn–Teller (DJT) ordering of the Mn3+ ions. Below TJT=269 K ...
Repository :
Document Server@UHasselt
Language(s) :
English
Primitive localizations of group algebras of polycyclic-by-finte groups
Author(s) :
WAUTERS, Paul
Description :
Let G be a polycyclic-by-finite group such that Delta(G) is torsion-free abelian and It a field. Denote by S a multiplicatively closed set of nun-zero central elements of K[G]; if K is an absolute field assume that S contains an element not in K. Our main result is when the localization K[G](S) is a...
Repository :
Document Server@UHasselt
Language(s) :
English
A degree inequality for Lie algebras with a regular Poisson semi-center
Description :
For Lie algebras whose Poisson semi-center is a polynomial ring we give a bound for the sum of the degrees of the generating semi-invariants. This bound was previously known in many special cases. (C) 2009 Elsevier Inc. All rights reserved.
Repository :
Document Server@UHasselt
Language(s) :
English
Titrating Theileria parva: Single stocks against combination of stocks
Author(s) :
Speybroeck, Niko
,
Marcotty, Tanguy
,
AERTS, Marc
,
Dolan, Tom
,
Williams, Brian
,
Lauer, Jeremy
,
MOLENBERGHS, Geert
,
BURZYKOWSKI, Tomasz
Description :
Theileria parva is the causative agent of East Coast fever (ECF), an important cattle disease in East and Central Africa. One of the methods for control of ECF is 'infection and treatment', a procedure in which an animal is infected with the live parasite and at the same time treated with a long-act...
Repository :
Document Server@UHasselt
Language(s) :
English