Results 41 to 50 of about 3,009,670 (368)
The derived category of a non generic cubic fourfold containing a plane
, 2017 We describe an Azumaya algebra on the resolution of singularities of the double cover of a plane ramified along a nodal sextic associated to a non generic cubic fourfold containing a plane.
Moschetti, Riccardo
core +1 more source
Algebras with cycle-finite Galois coverings [PDF]
Transactions of the American Mathematical Society, 2011 It is proved that every finite-dimensional algebra over an algebraically closed field which admits a cycle-finite Galois covering with torsion-free Galois group is tame, and a description of the indecomposable finite-dimensional modules over these algebras is given.
de la Peña, José A. +1 more
openaire +2 more sources
On the classification of quantum W-algebras
, 1991 In this paper we consider the structure of general quantum W-algebras. We introduce the notions of deformability, positive-definiteness, and reductivity of a W-algebra.
Bowcock, P., Watts, G
core +2 more sources
The exocenter and type decomposition of a generalized pseudoeffect algebra [PDF]
, 2012 We extend to a generalized pseudoeffect algebra (GPEA) the notion of the exocenter of a generalized effect algebra (GEA) and show that elements of the exocenter are in one-to-one correspondence with direct decompositions of the GPEA; thus the exocenter ...
D. Foulis, S. Pulmannová, E. Vinceková
semanticscholar +1 more source
Size Bounds and Query Plans for Relational Joins [PDF]
2008 49th Annual IEEE Symposium on Foundations of Computer Science, 2008 Relational joins are at the core of relational algebra, which in turn is the core of the standard database query language SQL. As their evaluation is expensive and very often dominated by the output size, it is an important task for database query ...
Albert Atserias, Martin Grohe, D. Marx
semanticscholar +1 more source
Closed form solution for p-curves in SO(4) [PDF]
, 2012 This paper describes the solution for p-curves in SO(4) and gives its closed form. The rotational symmetry was exploited in order to simplify the algebra.
Biggs, James +2 more
core +1 more source
Covering and gluing of algebras and differential algebras [PDF]
Journal of Geometry and Physics, 2000 Extending work of Budzynski and Kondracki, we investigate coverings and gluings of algebras and differential algebras. We describe in detail the gluing of two quantum discs along their classical subspace, giving a C*-algebra isomorphic to a certain Podles sphere, as well as the gluing of U_{\sqrt{q}}(sl_2)-covariant differential calculi on the discs.
Calow, Dirk, Matthes, Rainer
openaire +2 more sources
Vector fields on nonorientable surfaces
International Journal of Mathematics and Mathematical Sciences, 2003 A one-to-one correspondence is established between the germs of functions and tangent vectors on a NOS X and the bi-germs of functions, respectively, elementary fields of tangent vectors (EFTV) on the orientable double cover of X.
Ilie Barza, Dorin Ghisa
doaj +1 more source
Commentarii Mathematici Helvetici, 1994 Let \(\Lambda\) be an associative unitary finite-dimensional \(\mathbb{C}\)-algebra which is representation finite. This means that the number of isomorphism classes of indecomposable finite-dimensional \(\Lambda\)-left modules is finite. Let us fix a set \(\mathcal F\) of representatives for these isomorphism classes. We showed [\textit{C. Riedtmann},
openaire +2 more sources
Galois coverings of selfinjective algebras by repetitive algebras [PDF]
Transactions of the American Mathematical Society, 1999 Let \(A\) be a basic and connected selfinjective Artin algebra. Then the right and the left socles of \(A\) coincide and are denoted by \(\text{soc }A\). Two selfinjective algebras \(A\) and \(A'\) are called socle-equivalent if the quotient algebras \(A/\text{soc} A\) and \(A'/\text{soc} A'\) are isomorphic.
Skowroński, Andrzej, Yamagata, Kunio
openaire +2 more sources