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Mostrando ítems 1-20 de 88

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An extension of Kesten’s criterion for amenability to topological Markov chains

Stadlbauer, Manuel (Advances in Mathematics, 2013)

The main results of this note extend a theorem of Kesten for symmetric random walks on discrete groups to group extensions of topological Markov chains. In contrast to the result in probability theory, there is a notable ...
Arithmetic of normal Rees algebras

Herzog, Jürgen; Simis, Aron; Vasconcelos, Wolmer V. (Journal of Algebra, 1991)
Artinian rings in which one sided ideals are quasi-projective

Hill, D. A. (Acta Mathematica, 1982)
Bayesian inference for power law processes with applications in repairable systems

Oliveira, Maristela Dias de; Colosimo, Enrico A.; Gilardoni, Gustavo L. (2012)

Statistical models for recurrent events are of great interest in repairable systems reliability and maintenance. The adopted model under minimal repair maintenance is frequently a nonhomogeneous Poisson process with the ...
A Characterization of Principal Congruences of De Morgan Algebras and its Applications

Sankappanavar, H. P. (Studies in Logic and the Foundations of Mathematics, 1980)

In this paper a characterization of principal congruences of De Morgan algebras is given and from it we derive that the variety of De Morgan algebras has DPC and CEP. The characterization is then applied to give a new proof ...
Closed products of sets and the axiom of choice

Jesus, J. P. C. de; Silva, S. G. da (2011)

With a slight modification of a previous argument due to Schechter, we show that the Axiom of Choice is equivalent to the following topological statement: “If a product of a non-empty family of sets is closed in a topological ...
Codimension two submanifolds with 2-nonnegative curvature operator

Costa, Ézio de Araújo (2008)

In this paper we obtain a classification of compact n-submanifolds of the Euclidean space Rn+2 with 2-nonnegative curvature operator.
Cohen-Macaulay Rees algebras and degrees of polynomial relations

Simis, Aron; Ulrich, Bernd; Vasconcelos, Wolmer V. (1995)
Combinatorics of a certain ideal in the segre coordinate ring

Brumatti, Paulo; Gimenez, Philippe; Simis, Aron (Proceedings of the American Mathematical Society, 1996)

We focus on a \fat" model of an ideal in the class of the canonical ideal of the Segre coordinate ring, looking at its Rees algebra and related arithmetical questions.
Congruence lattices of pseudocomplemented semilattices

Sankappanavar, H. P. (Algebra Universalis, 1979)
Congruence-semimodular and congruence-distributive pseudocomplemented semilattices

Sankappanavar, H. P. (Algebra Universalis, 1982)

Investigations into the structure of the congruence lattices of pseudocomplemented semilattices (PCS's) were initiated in [10]. In this paper a we characterize the class of congruence-semimodular PCS's (i.e. PCS's ...
Construction of a canonical model for a first-order non-Fregean logic with a connective for reference and a total truth predicate

Lewitzka, Steffen (2012)

Logics with quantifiers that range over a model-theoretic universe of propositions are interesting for several applications. For example, in the context of epistemic logic the knowledge axioms can be expressed by the single ...
Correlation Decay and Recurrence Asymptotics for Some Robust Nonuniformly Hyperbolic Maps

Varandas, Paulo César Rodrigues Pinto (2008)

We study a robust class of multidimensional non-uniformly hyperbolic transformations considered by Oliveira and Viana (Ergod. Theory Dyn. Syst. 28:501–533, 2008). For an open class of Hölder continuous potentials with small ...
Covering properties which, under weak diamond principles, constrain the extents of separable spaces

Morgan, C.; Silva, S. G. da (2010)

We show that separable, locally compact spaces with property (a) necessarily have countable extent { i.e., have no uncountable closed, discrete sub- spaces { if the e®ective weak diamond principle }(!; !;<) holds. If the ...
Directional wavelets and a wavelet variogram for two-dimensional data

Bosch, E. H.; González, A. Paz; Vivas, J. G.; Easley, G. R. (2009)

This paper describes two new approaches that can be used to compute the two-dimensional experimental wavelet variogram. They are based on an extension from earlier work in one dimension. The methods are powerful 2D ...
Dominated splittings for flows with singularities

Araujo, Vitor; Arbieto, Alexander; Salgado, Luciana (2013)

We obtain sufficient conditions for an invariant splitting over a compact invariant subset of a C1 flow Xt to be dominated. In particular, we reduce the requirements to obtain sectional hyperbolicity and hyperbolicity.
Dynamic analysis of recurrent event data with missing observations, with application to infant diarrhoea in Brazil

Borgan, Ørnulf; Fiaccone, Rosemeire Leovigildo; Henderson, Robin; Barreto, Mauricio Lima (2007)

This paper examines and applies methods for modelling longitudinal binary data subject to both intermittent missingness and dropout. The paper is based around the analysis of data from a study into the health impact of a ...
Entropy and Poincaré recurrence from a geometrical viewpoint

Varandas, Paulo César Rodrigues Pinto (2009)

We study Poincaré recurrence from a purely geometrical viewpoint. In (Downarowicz and Weiss 2004 Illinois J. Math. 48 59–69) it was proven that the metric entropy is given by the exponential growth rate of return times to ...
Equilibrium states for non-uniformly expanding maps: Decay of correlations and strong stability

Castro, A.; Varandas, Paulo César Rodrigues Pinto (Annales de l'Institut Henri Poincare (C) Non Linear Analysis, 2013)

We study the rate of decay of correlations for equilibrium states associated to a robust class of non-uniformly expanding maps where no Markov assumption is required. We show that the Ruelle–Perron–Frobenius operator acting ...
Equivariant Schubert calculus

Gatto, Letterio; Santiago, Taíse (2010)

We describe T-equivariant Schubert calculus on G(k,n), T being an n-dimensional torus, through derivations on the exterior algebra of a free A-module of rank n, where A is the T-equivariant cohomology of a point. In ...

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