Listar MA - Artículos por título
Mostrando ítems 36-55 de 67
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Largest ideals in Leavitt path algebras.
(Springer Nature, 2020-02-22)We identify largest ideals in Leavitt path algebras: the largest locally left/right artinian (which is the largest semisimple one), the largest locally left/right noetherian without minimal idempotents, the largest exchange, ... -
Leavitt path algebras of Cayley graphs C_n^j.
(Springer Nature, 2018-09-15)Let n be a positive integer. For each 0 <= j <= n-1 we let C_n^j denote the Cayley graph of the cyclic group Zn with respect to the subset {1,j}. Utilizing the Smith Normal Form process, we give an explicit description of ... -
Lexicon-based sentiment analysis in texts using Formal Concept Analysis
(Elsevier, 2023)In this paper, we present a novel approach for sentiment analysis that uses Formal Concept Analysis (FCA) to create dictionaries for classification. Unlike other methods that rely on pre-defined lexicons, our approach ... -
Lexicon-based sentiment analysis in texts using Formal Concept Analysis.
(Elsevier, 2023-02-03)In this paper, we present a novel approach for sentiment analysis that uses Formal Concept Analysis (FCA) to create dictionaries for classification. Unlike other methods that rely on pre-defined lexicons, our approach ... -
Lorentzian Metrics Null-Projectively Related to Semi-Riemannian Metrics
(Springer Nature, 2022-12-19)We say that a Lorentzian metric and a semi-Riemannian metric on the same manifold M are null-projectively related if every null geodesic of the Lorentzian metric is an unparametrized geodesic of the semi-Riemannian one. ... -
Mean curvature of spacelike submanifolds in a Brinkmann spacetime
(2021)Several geometric properties of complete spacelike submanifolds, with codimension at least two, in a Brinkmann spacetime are shown from natural assumptions involving the mean curvature vector field $\mcv$ of the spacelike ... -
Mean Lipschitz spaces and a generalized Hilbert operator.
(Springer, 2018-02-28)If μ is a positive Borel measure on the interval [0, 1) we let H_μ be the Hankel matrix H_μ={ μ_{n,k} }_{n,k} with entries μ_{n,k} =μ_{n+k} where μ_n denotes the moment of order n of μ. This matrix induces formally an ... -
Numerical Methods That Preserve a Lyapunov Function for Ordinary Differential Equations
(IOAP-MDPI, 2022-12-25)The paper studies numerical methods that preserve a Lyapunov function of a dynamical system, i.e., numerical approximations whose energy decreases, just like in the original differential equation. With this aim, a discrete ... -
On projection methods for functional time series forecasting
(ScienceDirect, 2022-05)Two nonparametric methods are presented for forecasting functional time series (FTS). The FTS we observe is a curve at a discrete-time point. We address both one-step-ahead forecasting and dynamic updating. Dynamic updating ... -
On the existence of right adjoints for surjective mappings between fuzzy structures.
(National Research University Higher School of Economics, Russia, 2016)En este trabajo los autores continúan su estudio de la caracterización de la existencia de adjunciones (conexiones de Galois isótonas) cuyo codominio no está dotado de estructura en principio. En este artículo se considera ... -
On the regularity of null cones and geodesic spheres
(Springer, 2023)We show a property on the null cones in a Lorentzian manifold near a conjugate point, which contributes to the understanding of the behaviour of the exponential map. We also give an analogous property in the Riemannian case. -
Parameterized simplification logic I: reasoning with implications and classes of closure operators
(Taylor & Francis, 2020)In this paper, we present a general inference system for reasoning with if-then rules. They are defined using general lattice-theoretic notions and their semantics is defined using particular closure operators parameterized ... -
Parameterized Simplification Logic: Reasoning With Implications in an Automated Way
(IEEE, 2022)In this sequel to our previous article (Cordero et al., 2020) on general inference systems for reasoning with if–then dependencies, we study transformations of if–then rules to semantically equivalent collections of if–then ... -
Partition-based distributionally robust optimization via optimal transport with order cone constraints
(Springer, 2021)In this paper we wish to tackle stochastic programs affected by ambiguity about the probability law that governs their uncertain parameters. Using optimal transport theory, we construct an ambiguity set that exploits the ... -
Prescribing net demand for two-stage electricity generation scheduling
(Elsevier, 2023)We consider a two-stage generation scheduling problem comprising a forward dispatch and a real-time re-dispatch. The former must be conducted facing an uncertain net demand that includes non-dispatchable electricity ... -
Quasi-closed elements in fuzzy posets
(ELSEVIER, 2022-04)We generalize the notion of quasi-closed element to fuzzy posets in two stages: First, in the crisp style in which each element in a given universe either is quasi-closed or not. Second, in the graded style by defining ... -
Representations of relative Cohn path algebras.
(Elsevier, 2020-01-07)We study relative Cohn path algebras, also known as Leavitt-Cohn path algebras, and we realize them as partial skew group rings. To do this we prove uniqueness theorems for relative Cohn path algebras. Furthermore, given ... -
Rigidity results for complete spacelike submanifolds in plane fronted waves
(Springer, 2022-09-08)New rigidity results for complete non-compact spacelike submanifolds of arbitrary codimension in plane fronted waves are obtained. Under appropriate assumptions, we prove that a complete spacelike submanifold in these ... -
Scalable method for administration of resource technologies under stochastic procedures
(Elsevier, 2022-11-09)During the development of the S3Unica project (Smart Specialisation University Campus) and its application in the ASSET project (Advanced Systems Studies for Energy Transition), both within the European Commission, the ... -
Simplification logic for the management of unknown information
(Elsevier, 2023)This paper aims to contribute to the extension of classical Formal Concept Analysis (FCA), allowing the management of unknown information. In a preliminary paper, we define a new kind of attribute implications to represent ...