Results 61 to 70 of about 704,679 (196)
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We study eigenvalue problems for the de Rham complex on varying three‐dimensional domains. Our analysis includes the Helmholtz equation as well as the Maxwell system with mixed boundary conditions and non‐constant coefficients. We provide Hadamard‐type formulas for the shape derivatives under weak regularity assumptions on the domain and its ...
Pier Domenico Lamberti +2 more
wiley +1 more source
A note on the application of wazewski’s topological method to an integro: differential equation of volterra type [PDF]
, 2015 The purpose of this note is to generalize the Wazewski’s Topological Method 11, originally stated for ordinary differential equations, to the integro – differential equation of Volterra type (1), under suitable conditions on the functions involved.Fil ...
Guzmán, Paulo Matias +3 more
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Asymptotics for the Spectrum of the Laplacian in Thin Bars with Varying Cross Sections
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We consider spectral problems for the Laplace operator in 3D rod structures with a small cross section of diameter O(ε)$$ O\left(\varepsilon \right) $$, ε$$ \varepsilon $$ being a positive parameter. The boundary conditions are Dirichlet (Neumann, respectively) on the bases of this structure, and Neumann on the lateral boundary.
Pablo Benavent‐Ocejo +2 more
wiley +1 more source
From Stability to Chaos: A Complete Classification of the Damped Klein‐Gordon Dynamics
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We investigate the transition between stability and chaos in the damped Klein‐Gordon equation, a fundamental model for wave propagation and energy dissipation. Using semigroup methods and spectral criteria, we derive explicit thresholds that determine when the system exhibits asymptotic stability and when it displays strong chaotic dynamics ...
Carlos Lizama +2 more
wiley +1 more source
A note on the star order in Hilbert spaces [PDF]
, 2010 We study the star order on the algebra L(H) of bounded operators on a Hilbert space H. We present a new interpretation of this order which allows to generalize to this setting many known results for matrices: functional calculus, semi-lattice properties,
Antezana, Jorge Abel +3 more
core +1 more source
Mean‐Variance Payoff Applied to Stackelberg Games
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We analyse a Stackelberg duopoly in which the leader faces uncertainty about the intercept demand, while the follower observes the realised demand and decides whether to enter the market after the uncertainty is resolved. The leader evaluates the uncertainty by maximising a mean‐variance utility function that captures its risk aversion.
João M. Silva +3 more
wiley +1 more source
Matemática comparada con otras disciplinas en el índice de citación Scimago
Papeles, 2017 Este artículo presenta la producción de la disciplina de la matemática en los cinco primeros Journals (revistas especializadas), en términos de temas, bajo el índice de Scimago (15 de abril de 20171); se clasifican los títulos y resúmenes sacados de la ...
Laura Buitrago Niño +1 more
doaj +1 more source
As aulas de matemática na escolarização inclusiva de um sujeito cego: o caso Lucas
Revista Cocar, 2018 O trabalho aqui apresentado configura-se como um estudo de caso, no qual utilizamos como procedimento para coleta de dados uma entrevista semiestruturada composta por oito (08) questões e, para o tratamento dos dados, foi empregada parte da Análise de Conteúdo. O sujeito analisado, que assume o pseudônimo de Lucas nesse trabalho, é um aluno cego,
Borges, Fábio Alexandre +1 more
openaire +1 more source
High Relative Accuracy Computations With Covariance Matrices of Order Statistics
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT In many statistical applications, numerical computations with covariance matrices need to be performed. The error made when performing such numerical computations increases with the condition number of the covariance matrix, which is related to the number of variables and the strength of the correlation between the variables. In a recent work,
Juan Baz +3 more
wiley +1 more source
Metric geodesics of isometries in a Hilbert space and the extension problem [PDF]
, 2007 We consider the problem of finding short smooth curves of isometries in a Hilbert space H. The length of a smooth curve γ(t), t ∈ [0, 1], is measured by means of ∫^1-0 γ^. (t)ǀǀ dt, where ǀǀ ǀǀ denotes the usual norm of operators.
Andruchow, Esteban +2 more
core +1 more source