Search Results - subject:"manifolds"

A General Type of Almost Contact Manifolds

Ioan, Catalin Angelo - In: Acta Universitatis Danubius. OEconomica (2005) 1(1), pp. 41-54

Among almost contact manifolds Sasakian manifolds, Kenmotsu manifolds (called also “a certain class of almost contact … manifolds”) and cosymplectic manifolds have been studied by many authors. The purpose of this paper is to obtain a class of … almost contact manifolds which will generalize the above manifolds. The paper generalizes the RK-manifolds introduced by …

Persistent link: https://www.econbiz.de/10008751438

Geographical structure and convergence : a note on geometry in spatial growth models

Fabbri, Giorgio - In: Journal of economic theory 162 (2016), pp. 114-136

Persistent link: https://www.econbiz.de/10011593049

Automatic diagnosis of brain magnetic resonance images based on Riemannian geometry

Gouskir, Mohamed; Bouikhalene, Belaid; Aissaoui, Hicham; … - In: Journal of electronic commerce in organizations : the … 13 (2015) 2, pp. 30-40

Persistent link: https://www.econbiz.de/10011336568

CompDTIMe: Computing one-dimensional invariant manifolds for saddle points of discrete time dynamical systems

Panchuk, Anastasiia - Action IS1104 "The EU in the new complex geography of … - 2015

periodic points not depending on whether they are attracting, to compute one-dimensional stable and unstable manifolds of …

Persistent link: https://www.econbiz.de/10011198532

A note on the large random inner-product kernel matrices

Zeng, Xingyuan - In: Statistics & Probability Letters 99 (2015) C, pp. 192-201

-norm uniformly distributed over four manifolds. And we also show a result on isotropic and log-concave distributed random vectors …

Persistent link: https://www.econbiz.de/10011208323

Determinacy of equilibria of smooth infinite economies

Covarrubias, Enrique - Volkswirtschaftliche Fakultät, … - 2008

This paper deals with generic determinacy of equilibria for infinite dimensional consumption spaces. Our work could be seen as an infinite-dimensional analogue of Dierker and Dierker (1972), by characterising equilibria of an economy as a zero of the aggregate excess demand, and studying its...

Persistent link: https://www.econbiz.de/10005836675

Parametric persistence of multiple equilibria in an economy directly calibrated to 5 equilibria

Whalley, John; Zhang, Shunming - In: Economic modelling 41 (2014), pp. 356-364

Persistent link: https://www.econbiz.de/10010440720

The Nonsingularity of Γ in Covariance Structure Analysis of Nonnormal Data

Jennrich, Robert; Satorra, Albert - In: Psychometrika 79 (2014) 1, pp. 51-59

Covariance structure analysis of nonnormal data is important because in practice all data are nonnormal. When applying covariance structure analysis to nonnormal data, it is generally assumed that the asymptotic covariance matrix Γ for the nonredundant terms in the sample covariance matrix S is...

Persistent link: https://www.econbiz.de/10010998753

From simple structure to sparse components: a review

Trendafilov, Nickolay - In: Computational Statistics 29 (2014) 3, pp. 431-454

The article begins with a review of the main approaches for interpretation the results from principal component analysis (PCA) during the last 50–60 years. The simple structure approach is compared to the modern approach of sparse PCA where interpretable solutions are directly obtained. It is...

Persistent link: https://www.econbiz.de/10010847792

A stochastic approach to the harmonic map heat flow on manifolds with time-dependent Riemannian metric

Guo, Hongxin; Philipowski, Robert; Thalmaier, Anton - In: Stochastic Processes and their Applications 124 (2014) 11, pp. 3535-3552

We first prove stochastic representation formulae for space–time harmonic mappings defined on manifolds with evolving …

Persistent link: https://www.econbiz.de/10010907046