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Displaying 4261 – 4280 of 11160

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Intégrales de résolvantes et calcul symbolique

Francis Hirsch (1972)

Annales de l'institut Fourier

Soit f une transformée de Stieltjes. Notant H f un prolongement de la fonction f ( z - 1 ) à ( C R * { } ) , on définit, pour tout espace de Banach X et pour tout opérateur V sur X qui soit de domaine dense, fermé, d’ensemble résolvant contenant R * et qui vérifie sup λ > 0 ( I + λ V ) - 1 < , un opérateur H f ( V ) qui est un opérateur sur X de même nature que V . On montre que l’on a σ e [ H f ( V ) ] = H f [ σ e ( V ) ] (où σ e désigne le spectre étendu). En outre, l’opération H f a d’excellentes propriétés de stabilité. En particulier, si f 0 et si V est un potentiel abstrait, H f ( V ) est un potentiel...

Integrated version of the Post-Widder inversion formula for Laplace transforms

José E. Galé, María M. Martínez, Pedro J. Miana (2011)

Studia Mathematica

We establish an inversion formula of Post-Widder type for λ α -multiplied vector-valued Laplace transforms (α > 0). This result implies an inversion theorem for resolvents of generators of α-times integrated families (semigroups and cosine functions) which, in particular, provides a unified proof of previously known inversion formulae for α-times integrated semigroups.

Integro-differential equations on time scales with Henstock-Kurzweil delta integrals

Aneta Sikorska-Nowak (2011)

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

In this paper we prove existence theorems for integro - differential equations x Δ ( t ) = f ( t , x ( t ) , t k ( t , s , x ( s ) ) Δ s ) , t ∈ Iₐ = [0,a] ∩ T, a ∈ R₊, x(0) = x₀ where T denotes a time scale (nonempty closed subset of real numbers R), Iₐ is a time scale interval. Functions f,k are Carathéodory functions with values in a Banach space E and the integral is taken in the sense of Henstock-Kurzweil delta integral, which generalizes the Henstock-Kurzweil integral. Additionally, functions f and k satisfy some boundary conditions and conditions...

Integro-differential equations with time-varying delay

Chocholatý, Pavol (2013)

Programs and Algorithms of Numerical Mathematics

Integro-differential equations with time-varying delay can provide us with realistic models of many real world phenomena. Delayed Lotka-Volterra predator-prey systems arise in ecology. We investigate the numerical solution of a system of two integro-differential equations with time-varying delay and the given initial function. We will present an approach based on q -step methods using quadrature formulas.

Currently displaying 4261 – 4280 of 11160