Publicacions matemàtiques

Publicacions matemàtiques 51 registres trobats  La cerca s'ha fet en 0.01 segons. 
1.
10 p, 232.0 KB Non-commutative separability and group actions / Alfaro, Ricardo
We give conditions for the skew group ring S * G to be strongly separable and H-separable over the ring S. In particular we show that the H-separability is equivalent to S being central Galois extension. [...]
1992 - 10.5565/PUBLMAT_362A92_01
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 359-367  
2.
20 p, 562.0 KB The almost isomorphism relation for simple regular rings / Ara, Pere, 1959-, (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Goodearl, K. R. (University of Utah. Department of Mathematics)
A longstanding open problem in the theory of von Neumann regular rings is the question of whether every directly finite simple regular ring must be unit-regular. Recent work on this problem has been done by P. [...]
1992 - 10.5565/PUBLMAT_362A92_02
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 369-388  
3.
12 p, 355.0 KB Work of Pere Menal on normal subgroups / Arianghaus, F. A. ; Vaserstein, L. N.
1992 - 10.5565/PUBLMAT_362A92_03
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 389-400  
4.
6 p, 168.7 KB Behavior of countably generated pure-projective modules / Azumaya, Goro
We first prove that every countably presented module is a pure epimorphic image of a countably generated pure-projective module, and by using this we show that if every countably generated pure-projective module is pure-injective then every module is pure-injective, while if in any countably generated pure-projective module every countably generated pure-projective pure submodule is a direct summand then every module is pure-projective.
1992 - 10.5565/PUBLMAT_362A92_04
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 401-406  
5.
14 p, 361.1 KB Cohomology, symmetry, and perfection / Bifet, Emili
We explain the philosophy behind the computations in [BDP] and place them in a wider conceptual setting. We also outline, for toric varieties, the resulting equivariant approach to some key results in that theory.
1992 - 10.5565/PUBLMAT_362A92_05
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 407-420  
6.
6 p, 125.8 KB A uniqueness theorem for invariantly harmonic functions in the unit ball of Cn / Bruna, Joaquim (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
1992 - 10.5565/PUBLMAT_362A92_06
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 421-426  
7.
11 p, 270.4 KB Local cohomology in classical rings / Bueso, J. L. ; Jara, P.
The aim of this paper is to stablish the close connection between prime ideals and torsion theories in anon necessarily commutative noetherian ring. We introduce a new definition of support of a module and characterize some kinds of torsion theories in terms of prime ideals. [...]
1992 - 10.5565/PUBLMAT_362A92_07
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 427-437  
8.
9 p, 246.3 KB On the unit-1-stable rank of rings of analytic functions / Carmona Domènech, Joan Josep (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Cufí, Julià, 1945- (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Menal Brufal, Pere, 1951-1991 (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
In this paper we prove a general result for the ring H(U) of the analytic functions on an open set U in the complex plane which implies that H(U) has not unit-1-stable rank and that has some other interesting consequences. [...]
1992 - 10.5565/PUBLMAT_362A92_08
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 439-447  
9.
13 p, 264.2 KB Interpolation of families / Carro, M. J. ; Cerdà Martín, Joan Lluís (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
1992 - 10.5565/PUBLMAT_362A92_09
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 449-461  
10.
4 p, 110.2 KB On finite groups acting on acyclic complexes of dimension two / Casacuberta i Vergés, Carles ; Dicks, Warren 1947-
We conjecture that every finite group C acting on a contractible CW-complex X of dimension 2 has at least one fixed point. We prove this in the case where G is solvable, and under this additional hypothesis, the result holds for X acyclic.
1992 - 10.5565/PUBLMAT_362A92_10
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 463-466  
11.
6 p, 143.5 KB Algebraic properties of the Lefschetz zeta function, periodic points and topological entropy / Casasayas, Josefina ; Llibre, Jaume (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Nunes, Ana
The Lefschetz zeta function associated to a continuous self-map f of a compact manifold is a rational function P/Q. According to the parity of the degrees of the polinomials P and Q, we analize when the set of periodic points of f is infinite and when the topological entropy is positive.
1992 - 10.5565/PUBLMAT_362A92_11
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 467-472  
12.
8 p, 195.6 KB Maximal quotient rings and essential right ideals in group rings of locally finite groups / Cedó, Ferran (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Hartley, Brian (University of Manchester. Department of Mathematics)
1992 - 10.5565/PUBLMAT_362A92_12
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 473-480  
13.
4 p, 100.3 KB A remark on power series rings / Cohn, P. M. (University College London. Department of Mathematics)
A trivializability principle for local rings is described which leads to a form of weak algorithm for local semifirs with a finitely generated maximal ideal whose powers meet in zero.
1992 - 10.5565/PUBLMAT_362A92_13
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 481-484  
14.
4 p, 118.7 KB On one-sided division infinite-dimensional normed real algebras / Cuenca Mira, José Antonio
In this note we introduce the concept of Cayley homomorphism which is closely related with those of composition algebra and normalized orthogonal multiplication. The key result shows the existente of certain types of Cayley homomorphisms for infinite dimension. [...]
1992 - 10.5565/PUBLMAT_362A92_14
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 485-488  
15.
43 p, 1.0 MB Categorical methods in graded ring theory / Del Río, Ángel (Universidad de Murcia. Departamento de Matemáticas)
Let G be a group, R a G-graded ring and X a right G-set . We study functors between categories of modules graded by G-sets, continuing the work of [M]. As an application we obtain generalizations of Cohen-Montgomery Duality Theorems by categorical methods. [...]
1992 - 10.5565/PUBLMAT_362A92_15
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 489-531  
16.
8 p, 224.0 KB The "corollarium II" to the proposition XXIII of Saccheri's Euclides / Dou, Albert
This "Corolarium" of the Euclides (1733) contains an original proof of propositions 1. 27 and 1 . 28 of Euclid's Elements. In the same corollary Saccheri explains why he dispenses "not only with the propositions 1 . [...]
1992 - 10.5565/PUBLMAT_362A92_16
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 533-540  
17.
27 p, 703.3 KB Self-injective Von Neumann regular subrings and a theorem of Pere Menal / Faith, Carl
1992 - 10.5565/PUBLMAT_362A92_17
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 541-567  
18.
21 p, 513.4 KB On annihilators in Jordan algebras / Fernández López, Antonio
In this paper we prove that a nondegenerate Jordan algebra satisfying the descending chain condition on the principal inner ideals, also satisfy the ascending chain condition on the annihilators of the principal inner ideals . [...]
1992 - 10.5565/PUBLMAT_362A92_18
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 569-589  
19.
9 p, 250.6 KB A note on Sugihara algebras / Font, Josep M. (Universitat de Barcelona. Departament de Lógica) ; Rodríguez Pérez, Gonzalo (Universitat de Barcelona. Departament de Técniques Empresarials)
1992 - 10.5565/PUBLMAT_362A92_19
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 591-599  
20.
8 p, 204.5 KB Algebraic characteristic classes for idempotent matrices / Gómez Ruiz, Francisco (Universidad de Málaga. Departamento de Álgebra, Geometría y Topología)
This paper contains the algebraic analog for idempotent matrices of the Chern-Weil theory of characteristic classes. This is used to show, algebraically, that the canonical line bundle on the complex projective space is not stably trivial. [...]
1992 - 10.5565/PUBLMAT_362A92_20
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 601-608  
21.
15 p, 427.4 KB Strongly graded left FTF rings / Gómez, José (Universidad de Granada. Departamento de Matemática Aplicada) ; Torrecillas, Blas (Universidad de Granada. Departamento de Algebra)
1992 - 10.5565/PUBLMAT_362A92_21
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 609-623  
22.
11 p, 338.8 KB Morita duality for Grothendieck categories / Gómez Pardo, J. L. ; Guil Asensio, P. A.
1992 - 10.5565/PUBLMAT_362A92_22
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 625-635  
23.
18 p, 514.7 KB Notes on a class of simple C*-algebras with real rank zero / Goodearl, K. R.
A construction method is presented for a class of simple C*-algebras whose basic properties -including their real ranks- can be computed relatively easily, using linear algebra. A numerical invariant attached to the construction determines whether a given algebra has real rank 0 or 1 . [...]
1992 - 10.5565/PUBLMAT_362A92_23
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 637-654  
24.
8 p, 197.1 KB Some remarks on almost finitely generated nilpotent groups / Hilton, Peter (State University of New York. Department of Mathematical Sciences) ; Militello, Robert (Rhodes College (Memphis, Estats Units d'Amèrica). Department of Mathematics)
We identify two generalizations of the notion of a finitely generated nilpotent. Thus a nilpotent group G is fgp if Gp is fg as p-local group for each p; and G is fg-like if there exists a fg nilpotent group H such that Gp = Hp for all p. [...]
1992 - 10.5565/PUBLMAT_362A92_24
Publicacions matemàtiques, Vol. 36 Núm. 2 (1992) , p. 655-662  
25.
9 p, 239.7 KB Ultraproduits gradués : applications / Ion, Ion D. ; Nivá, Constantin
1992 - 10.5565/PUBLMAT_362A92_25
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 663-671  
26.
11 p, 276.3 KB Gabriel filters in Grothendieck categories / Jeremías López, A. ; López López, M. P. ; Villanueva Nóvoa, E.
1992 - 10.5565/PUBLMAT_362A92_26
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 673-683  
27.
7 p, 214.5 KB The determination of Abelian hall subgroups by a conjugacy class structure / Kimmerle, Wolfgang ; Sandling, Robert
The object of the article is to show that a Jordan-Hölder class structure of a finite group determines abelian Hall subgroups of the group up to isomorphism. The proof uses the classification of the finite simple groups.
1992 - 10.5565/PUBLMAT_362A92_27
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 685-691  
28.
22 p, 630.7 KB Quantum sections and Gauge algebras / Le Bruyn, L. ; Van Oystaeyen, F.
Using quantum sections of filtered rings and the associated Rees rings one can lift the scheme structure on Proj of the associated graded ring to the Proj of the Rees ring . The algebras of interest here are positively filtered rings having a non-commutative regular quadratic algebra for the associated graded ring ; these are the socalled gauge algebras obtaining their name from special examples appearing in E. [...]
1992 - 10.5565/PUBLMAT_362A92_28
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 693-714  
29.
10 p, 179.4 KB Power-cancellation of CW-complexes with few cells / Llerena, Irene
In this paper, we use the fact that the rings of integer matrices have the power-substitution property in order to obtain a powercancellation property for homotopy types of CW-complexes with one cell in dimensions 0 and 4n and a finite number of cells in dimension 2n.
1992 - 10.5565/PUBLMAT_362A92_29
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 715-724  
30.
18 p, 461.1 KB Cohomologie locale de certains anneaux Auslander-Gorenstein / Malliavin, Mame-Paule
We give axiornatic conditions in order to calculate the local collomology of some idempotent kernel functors . The results lie on some new dimension introduced by T. Levasseur for Auslander-Gorenstein rings . [...]
1992 - 10.5565/PUBLMAT_362B92_01
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 725-742  
31.
18 p, 455.3 KB How to solve an operator equation / Mathieu, Martin
This article summarizes a series of lectures delivered at the Mathernatics Departrnent of the University of Leipzig, Germany in April 1991, which were to overview techniques for solving operator equations en C*-algebras connected with methods developed in a Spanish-Gerrnan research project on "Structure and Applications of C*-Algebras of Quotients" (SACQ) . [...]
1992 - 10.5565/PUBLMAT_362B92_02
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 743-760  
32.
12 p, 263.0 KB Non-obstructed subcanonical space curves / Miró-Roig, Rosa M.
1992 - 10.5565/PUBLMAT_362B92_03
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 761-772  
33.
15 p, 292.5 KB Tensor products of partial algebras / Monserrat, M. ; Rosselló, F. ; Torrens. J.
In this paper we introduce the tensor product of partial algebras w. r. t. a quasi-primtive class of partial algebras, and we prove some of its main properties. This construction generalizes the well-known tensor product of total algebras w. [...]
1992 - 10.5565/PUBLMAT_362B92_04
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 773-787  
34.
18 p, 434.6 KB Cohomologias elípticas (un ensayo introductorio) / Moreno, Guillermo
1992
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 789-806  
35.
19 p, 398.5 KB Stratifications parfaites et théorie des poids / Navarro Aznar, Vicente
In this paper, we emphasize Deligne's theory of weights, in order to prove that some stratifications of algebraic varieties are perfect. In particular, we study in some detail the Bialynicki-Birula's stratifications and the stratifications considered by F. [...]
1992 - 10.5565/PUBLMAT_362B92_06
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 807-825  
36.
9 p, 177.2 KB Chaos expansions and local times / Nualart, David (Universitat de Barcelona. Facultat de Matemàtiques) ; Vives, Josep (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
1992 - 10.5565/PUBLMAT_362B92_07
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 827-836  
37.
23 p, 461.0 KB Division and extension in weighted Bergman-Sobolev spaces / Ortega, Joaquin M. ; Fábrega, Joan
1992 - 10.5565/PUBLMAT_362B92_08
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 837-859  
38.
18 p, 479.1 KB The adjoint representation of group algebras and enveloping algebras / Passman, D. S.
In this paper we study the Hopf adjoint action of group algebras and enveloping algebras. We are particularly concerned with determining when these representations are faithful. Delta methods allow us to reclute the problem to certain better behaved subalgebras. [...]
1992 - 10.5565/PUBLMAT_362B92_09
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 861-878  
39.
32 p, 820.5 KB The fundamental theorem of algebra before Carl Friedrich Gauss / Pla i Carrera, Josep
This is a paper about the first attempts of the demonstration of the fundamental theorem of algebra. Before, we analyze the tie between complex numbers and the number of roots of an equation of -n-th degree. [...]
1992 - 10.5565/PUBLMAT_362B92_10
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 879-911  
40.
11 p, 309.8 KB On algebraic closures / Raphael, R.
This is a description of some different approaches which have been taken to the problem of generalizing the algebraic closure of a field. Work surveyed is by Enochs and Hochster (commutative algebra), Raphael (categories and rings of quotients), Borho (the polynomial approach), and Carson (logic). [...]
1992 - 10.5565/PUBLMAT_362B92_11
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 913-922  
41.
30 p, 823.0 KB One-sided division absolute valued algebras / Rodríguez Palacios, Angel
We develop a structure theory for left division absolute valued algebras which shows, among other things, that the norm of such an algebra comes from an inner product. Moreover, we prove the existence of left division complete absolute valued algebras with left unit of arbitrary infinite hilbertian dimension and with the additional property that they nave no nonzero proper closed left ideals. [...]
1992 - 10.5565/PUBLMAT_362B92_12
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 925-954  
42.
10 p, 299.1 KB Isomorphisms between representations of algebras / Saorín, Manuel
In this paper we study the precise relation between two representations of a given split basic finite dimensional algebra A as a factor of the free path algebra over its quiver (A). After defining the notion of strongly acyclic quiver, we apply the results obtained to develop a method of calculating the group Aut(A)/Inn(A) in the case when (A) is strongly acyclic.
1992 - 10.5565/PUBLMAT_362B92_13
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 955-964  
43.
15 p, 393.1 KB Adic-completion and some dual homological results / Simon, Anne-Marie
1992 - 10.5565/PUBLMAT_362B92_14
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 965-979  
44.
7 p, 170.0 KB On the density of some wiener functionals : an application of Malliavin calculus / Sintes Blanc, Antoni
Using a representation as an infinite linear combination of chisquare independent random variables, it is shown that some Wiener functionals, appearing in empirical characteristic process asymptotic theory, have densities which are tempered in the properly infinite case and exponentially decaying in the finite case.
1992 - 10.5565/PUBLMAT_362B92_15
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 981-987  
45.
11 p, 248.4 KB L1 and L°°-estimates with a local weight for the a-equation on convex domains in Cn / Tugores, Francesc
1992 - 10.5565/PUBLMAT_362B92_16
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 989-999  
46.
10 p, 263.6 KB Bilinear forms for SL(2, q), Àn and similar groups / Turull, Alexandre
The set of invariant symmetric bilinear forms on irreducible modules over fields of characteristic zero for certain groups is studied. Results are obtained under the presence in a finite group of elements of order four whose square is central. [...]
1992 - 10.5565/PUBLMAT_362B92_17
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1001-1010  
47.
17 p, 479.3 KB On certain classes of modules / Varadarajan, K.
1992 - 10.5565/PUBLMAT_362B92_18
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1011-1027  
48.
6 p, 137.7 KB A weak type inequality for cauchy transforms of finite measures / Verdera Melenchón, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques)
1992 - 10.5565/PUBLMAT_362B92_19
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1029-1034  
49.
18 p, 420.8 KB Relative hermitian morita theory. Part II : Hermitian Morita contexts / Verhaeghe, P. ; Verschoren, A.
We introduce the notion of a relative hermitian Morita context between torsion triples and show how these induce equivalences between suitable quotient categories of left and right modules. Due to the lack of involutive bimodules, the induced Morita equivalences are not necessarily hermitian, however.
1992 - 10.5565/PUBLMAT_362B92_20
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1035-1052  
50.
21 p, 547.2 KB On the inverse problem of Galois theory / Vila, Nuria (Universitat de Barcelona.Departament d'Algebra i Geometria)
The problem of the construction of number fields with Galois group over Q a given finite groups has made considerable progress in recent years. The aim of this paper is to survey the current state of this problem, giving the most significant methods developed in connection with it.
1992 - 10.5565/PUBLMAT_362B92_21
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1053-1073  
51.
10 p, 219.3 KB On the structure of the canonical module of the Rees álgebra and the associated graded ring of an ideal / Zarzuela, S.
In this note we give the description of a morphism related with.
1992 - 10.5565/PUBLMAT_362B92_22
Publicacions matemàtiques, Vol. 36, Núm. 2 (1992) , p. 1075-1084  

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