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Continuity of the non-convex play operator in the space of rectifiable curves

Jana Kopfová, Vincenzo Recupero (2023)

Applications of Mathematics

We prove that the vector play operator with a uniformly prox-regular characteristic set of constraints is continuous with respect to the B V -norm and to the B V -strict metric in the space of rectifiable curves, i.e., in the space of continuous functions of bounded variation. We do not assume any further regularity of the characteristic set. We also prove that the non-convex play operator is rate independent.

Destabilization for quasivariational inequalities of reaction-diffusion type

Vítězslav Babický (2000)

Applications of Mathematics

We consider a reaction-diffusion system of the activator-inhibitor type with unilateral boundary conditions leading to a quasivariational inequality. We show that there exists a positive eigenvalue of the problem and we obtain an instability of the trivial solution also in some area of parameters where the trivial solution of the same system with Dirichlet and Neumann boundary conditions is stable. Theorems are proved using the method of a jump in the Leray-Schauder degree.

Estimates for k -Hessian operator and some applications

Dongrui Wan (2013)

Czechoslovak Mathematical Journal

The k -convex functions are the viscosity subsolutions to the fully nonlinear elliptic equations F k [ u ] = 0 , where F k [ u ] is the elementary symmetric function of order k , 1 k n , of the eigenvalues of the Hessian matrix D 2 u . For example, F 1 [ u ] is the Laplacian Δ u and F n [ u ] is the real Monge-Ampère operator det D 2 u , while 1 -convex functions and n -convex functions are subharmonic and convex in the classical sense, respectively. In this paper, we establish an approximation theorem for negative k -convex functions, and give several...

Examples of bifurcation of periodic solutions to variational inequalities in κ

Milan Kučera (2000)

Czechoslovak Mathematical Journal

A bifurcation problem for variational inequalities U ( t ) K , ( U ˙ ( t ) - B λ U ( t ) - G ( λ , U ( t ) ) , Z - U ( t ) ) 0 for all Z K , a.a. t 0 is studied, where K is a closed convex cone in κ , κ 3 , B λ is a κ × κ matrix, G is a small perturbation, λ a real parameter. The main goal of the paper is to simplify the assumptions of the abstract results concerning the existence of a bifurcation of periodic solutions developed in the previous paper and to give examples in more than three dimensional case.

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