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Maximal regularity for second order non-autonomous Cauchy problems

Charles J. K. Batty, Ralph Chill, Sachi Srivastava (2008)

Studia Mathematica

We consider some non-autonomous second order Cauchy problems of the form ü + B(t)u̇ + A(t)u = f(t ∈ [0,T]), u(0) = u̇(0) = 0. We assume that the first order problem u̇ + B(t)u = f(t ∈ [0,T]), u(0) = 0, has L p -maximal regularity. Then we establish L p -maximal regularity of the second order problem in situations when the domains of B(t₁) and A(t₂) always coincide, or when A(t) = κB(t).

Maximal regularity of delay equations in Banach spaces

Carlos Lizama, Verónica Poblete (2006)

Studia Mathematica

We characterize existence and uniqueness of solutions for an inhomogeneous abstract delay equation in Hölder spaces. The main tool is the theory of operator-valued Fourier multipliers.

Maximal regularity of second-order evolution equations with infinite delay in Banach spaces

Xianlong Fu, Ming Li (2014)

Studia Mathematica

By using Fourier multiplier theorems we characterize the existence and uniqueness of periodic solutions for a class of second-order differential equations with infinite delay. We also establish maximal regularity results for the equations in various spaces. An example is provided to illustrate the applications of the results obtained.

Maximum number of limit cycles for generalized Liénard polynomial differential systems

Aziza Berbache, Ahmed Bendjeddou, Sabah Benadouane (2021)

Mathematica Bohemica

We consider limit cycles of a class of polynomial differential systems of the form x ˙ = y , y ˙ = - x - ε ( g 21 ( x ) y 2 α + 1 + f 21 ( x ) y 2 β ) - ε 2 ( g 22 ( x ) y 2 α + 1 + f 22 ( x ) y 2 β ) , where β and α are positive integers, g 2 j and f 2 j have degree m and n , respectively, for each j = 1 , 2 , and ε is a small parameter. We obtain the maximum number of limit cycles that bifurcate from the periodic orbits of the linear center x ˙ = y , y ˙ = - x using the averaging theory of first and second order.

Maximum principle for optimal control of fully coupled forward-backward stochastic differential delayed equations

Jianhui Huang, Jingtao Shi (2012)

ESAIM: Control, Optimisation and Calculus of Variations

This paper deals with the optimal control problem in which the controlled system is described by a fully coupled anticipated forward-backward stochastic differential delayed equation. The maximum principle for this problem is obtained under the assumption that the diffusion coefficient does not contain the control variables and the control domain is not necessarily convex. Both the necessary and sufficient conditions of optimality are proved. As illustrating examples, two kinds of linear quadratic...

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