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Publicacions matemàtiques

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Publicacions matemàtiques 11 registres trobats  La cerca s'ha fet en 0.01 segons. 
1.
43 p, 337.0 KB Statistical inference for stochastic parabolic equations : a spectral approach / Lototsky, S. V. (University of Southern California. Department of Mathematics)
A parameter estimation problem is considered for a stochastic par- abolic equation driven by additive Gaussian noise that is white in time and space. The estimator is of spectral type and utilizes a finite number of the spatial Fourier coefficients of the solution. [...]
2009 - 10.5565/PUBLMAT_53109_01
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 3-45  
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2.
25 p, 237.5 KB Estimates for the first eigenfunction of linear eigenvalue problems via Steiner symmetrization / Chiacchio, Francesco (Università di Napoli "Federico II". Dipartimento di Matematica e Applicazioni "R. Caccioppoli")
By means of Steiner symmetrization we get some estimates for the first eigenfunction of a class of linear problems, having as prototype the Laplacian with Dirichlet boundary conditions.
2009 - 10.5565/PUBLMAT_53109_02
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 47-71  
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3.
10 p, 139.2 KB On fixed points of automorphisms of non-orientable unbordered Klein surfaces / Gromadzki, G. (University of Gdánsk (Polònia). Institute of Mathematics)
In 1973, Macbeath found a general formula for the number of points fixed by an arbitrary orientation preserving automorphism of a Riemann surface X. It was given in terms of a group G of conformal automorphisms of X and the ramification data of the covering X --> X/G, which corresponds to the so called universal covering transformation group. [...]
2009 - 10.5565/PUBLMAT_53109_03
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 73-82  
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4.
28 p, 272.9 KB A characterization of Gromov hyperbolicity of surfaces with variable negative curvature / Portilla, Ana (Universidad Carlos III de Madrid. Departamento de Matemáticas) ; Tourís, Eva (Universidad Carlos III de Madrid. Departamento de Matemáticas)
In this paper we show that, in order to check Gromov hyperbolicity of any surface with curvature K≤ −k² < 0, we just need to verify the Rips condition on a very small class of triangles, namely, those contained in simple closed geodesics. [...]
2009 - 10.5565/PUBLMAT_53109_04
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 83-110  
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5.
8 p, 119.3 KB Cusp algebras / Agler, Jim (University of California. Department of Mathematics) ; McCarthy, John E. (Washington University. Mathematics Department)
A cusp is the image of the unit disk under a proper holomorphic map into Cn that is one-to-one and whose derivative vanishes at exactly one point. It is simple if not all the second derivatives vanish. [...]
2009 - 10.5565/PUBLMAT_53109_05
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 111-118  
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6.
22 p, 215.4 KB Faithful linear representations of bands / Cedó, Ferran (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Okniński, Jan (Warsaw University (Polònia). Institute of Mathematics)
A band is a semigroup consisting of idempotents. It is proved that for any field K and any band S with finitely many components, the semigroup algebra K [S] can be embedded in upper triangular matrices over a commutative K-algebra. [...]
2009 - 10.5565/PUBLMAT_53109_06
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 119-140  
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7.
38 p, 321.9 KB Besov capacity and Hausdorff measures in metric measure spaces / Costea, Şerban (McMaster University (Canadà). Department of Mathematics and Statistics)
This paper studies Besov ρ-capacities as well as their relationship to Hausdorff measures in Ahlfors regular metric spaces of dimension Q for 1 < Q < p < ∞. Lower estimates of the Besov ρ-capacities are obtained in terms of the Hausdorff content associated with gauge functions h satisfying the decay condition ∫o¹ h(t)¹/(p-1) dt/t < ∞.
2009 - 10.5565/PUBLMAT_53109_07
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 141-178  
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8.
18 p, 193.1 KB BCR algorithm and the T(b) Theorem / Auscher, Paul (Université de Paris-Sud) ; Yang, Qi Xiang (Wuhan University (Xina). Mathematic and Statistic school)
We show using the Beylkin-Coifman-Rokhlin algorithm in the Haar basis that any singular integral operator can be written as the sum of a bounded operator on Lp, 1 < p < ∞, and of a perfect dyadic singular integral operator. [...]
2009 - 10.5565/PUBLMAT_53109_08
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 179-196  
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9.
34 p, 317.6 KB Beltrami equations with coefficient in the Sobolev space W1,p / Clop, Albert (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Faraco, D. (Universidad Autónoma de Madrid. Departamento de Matemáticas) ; Mateu Bennassar, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Orobitg i Huguet, Joan (Universitat Autònoma de Barcelona. Departament de Matemàtiques) ; Zhong, X. (University of Jyväskylä. Department of Mathematics and Statistics)
We study the removable singularities for solutions to the Beltrami equation ∂f = µ ∂f, where µ is a bounded function, kµk∞ ≤ K−1 K+1 < 1, and such that µ ∈ W1,p for some p ≤ 2. Our results are based on an extended version of the well known Weyl's lemma, asserting that distributional solutions are actually true solutions. [...]
2009 - 10.5565/PUBLMAT_53109_09
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 197-230  
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10.
14 p, 159.1 KB Operator valued BMO and commutators / Blasco de la Cruz, Oscar (Universitat de València. Departament de Matemàtiques)
If E is a Banach space, b ∈ BMO(Rn, L(E) and T is a L(E)-valued Calderón-Zygmund type operator with operator-valued kernel k, we show the boundedness of the commutator Tb(f) = bT(f) − T(bf) on Lp(Rn,E) for 1 < p < ∞ whenever b and k verify some commuting properties. [...]
2009 - 10.5565/PUBLMAT_53109_10
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 231-244  
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11.
12 p, 154.8 KB Singular integrals on Sierpinski gaskets / Chousionis, Vasilis (University of Helsinki. Department of Mathematics and Statistics)
We construct a class of singular integral operators associated with homogeneous Calderón-Zygmund standard kernels on d-dimensional, d < 1, Sierpinski gaskets Ed. These operators are bounded in L2(μd) and their principal values diverge μd almost everywhere, where μd is the natural (d-dimensional) measure on Ed.
2009 - 10.5565/PUBLMAT_53109_11
Publicacions matemàtiques, V. 53 n. 1 (2009) p. 245-256  
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