101,635 research outputs found
On the existence of solutions for nonlinear impulsive periodic viable problems
No full textIn this paper we prove the existence of periodic solutions for nonlinear impulsive viable problems monitored by differential inclusions of the type x' (t) is an element of F (t, x(t)) + G (t, x(t)). Our existence theorems extend, in a broad sense, some propositions proved in [10] and improve a result due to Hristova-Bainov in [13]
Existence theorems for nonlinear evolution inclusions
No full textIn this paper we obtain an existence theorem for the abstract Cauchy problem for multivalued differential equations of the form u′∈ - ∂-f(u) + G(u), u(O) = x0, where ∂-f is the Fréchet subdifferential of a function f defined on an open subset Ω of a real separable Hilbert space H, taking its values in R ∪ {+ ∞} and G is a multifunction from C([0, T], Ω) into the nonempty subsets of L2([0, T], H). As an application we obtain an existence theorem for the multivalued perturbed problem x′∈ - ∂-f(x) + F(t, x), x(0) = x0, where F:[0, T] × Ω → n(H) is a multifunction satisfying some regularity assumptions
The Neumann problem for quasilinear differential equations
No full textsummary:In this note we prove the existence of extremal solutions of the quasilinear Neumann problem , a.e. on , , in the order interval , where and are respectively a lower and an upper solution of the Neumann problem
Existence Results for Implicit Nonlinear Second-Order Differential Inclusions
No full textIn this paper, we consider a Cauchy problem driven by an implicit nonlinear second-order differential inclusion presenting the sum of two real-valued multimaps, one taking convex values and the other assuming closed values, on the right-hand side. We first obtain, on the basis of a selection theorem proved by Kim, Prikry and Yannelis and on an existence result proved by Cubiotti and Yao (Adv Differ Equ 214:1- 10, 2016), an existence theorem for an initial value problem governed by a non implicit second-order differential inclusion involving two multimaps whose values are subsets of R-n. Next, we prove the existence of solutions in the Sobolev space W-2,W-infinity([0, T],R-n) for the considered implicit problem. A fundamental tool employed to achieve our goal is a profound result of B. Ricceri on inductively open functions. Moreover, we derive from the aforementioned results two corollaries that examine the viable cases. An application to Sturm-Liouville differential inclusions is also discussed. Lastly, we focus on a Cauchy problem monitored by a second-order differential inclusion having as nonlinearity on the second-order derivative a trigonometric map
Relazioni tra una multifunzione e la sua frontiera
No full textDenote by "frF" the multivalued mapping defined as the boundary of F. In the paper, in the setting T topological space and X is a topological linear space, the author studies the connection existing between the lower [respectively, upper] semicontinuity of the multivalued mapping F, and the lower [respectively, upper] semicontinuity of "frF". This paper can be seen as an extension of a previous work by the author and F. Papalini
Existence theorems for periodic semilinear impulsive problems (viable and not viable cases)
No full textIn this paper we prove the existence of solutions for a periodic impul-
sive problem monitored by a semilinear dierential inclusion. We study the problem both in the viable case and in the not
viable one and, for the not viable problem, and in both cases we obtain theorems which improve
results already appeared in the literature
Sturm–Liouville Differential Inclusions with Set-Valued Reaction Term Depending on a Parameter
No full textIn this paper we study the controllability for a Cauchy problem governed by a nonlinear differential inclusion driven by a Sturm-Liouville type operator. In particular, the considered second order differential inclusion involves a set-valued reaction term depending on a parameter. The key tool in the proof of the controllability result we provide is a multivalued version of the theorem recently proved by Haddad-Yarou, here established for an initial conditions problem monitored by a nonlinear second order differential inclusion presenting the sum of two multimaps on the right-hand side. We thereby deduce the existence of a local admissible pair for the considered control problem, that is the existence of a couple of functions consisting of a control, which is a measurable function, and the correspondent trajectory, which is an absolutely continuous function with absolutely continuous derivative. Secondly, under appropriate assumptions on the involved multimaps, we obtain an increased regularity for the solutions produced by our existence result. This regularity is the same of that recently tested by Bonanno, Iannizzotto and Marras for a different type of problem, which however involves the Sturm-Liouville operator
Hereditary Evolution Processes Under Impulsive Effects
No full textIn this note, we deal with a model of population dynamics with memory effects subject to instantaneous external actions. We interpret the model as an impulsive Cauchy problem driven by a semilinear differential equation with functional delay. The existence of delayed impulsive solutions to the Cauchy problem leads to the presence of hereditary impulsive dynamics for the model. Furthermore, using the same procedure we study a nonlinear reaction–diffusion model
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