On higher order generalized Emden-Fowler differential equations with delay argument

In the paper the differential equation u⁽ⁿ⁾ (t) + p(t)|u(τ (t))|^(µ(t)) sign u(τ (t)) = 0, is considered. Here, we assume that n ≥ 3, p ∈ Lloc(R₊; R₋), µ ∈ C(R₊; (0, +∞)), τ ∈ C(R₊; R₊), τ (t) ≤ t for t ∈ R₊ and limt→+∞ τ (t) = +∞. In case µ(t) ≡ const > 0, oscillatory properties of equation have been extensively studied, where as if µ(t) ≢ const, to the extent of authors’ knowledge, the analogous questions have not been examined. In this paper, new sufficient conditions for the equation (∗) to have Property B are established.Розглянуто диференцiальне рiвняння u⁽ⁿ⁾ (t) + p(t)|u(τ (t))|^(µ(t)) sign u(τ (t)) = 0 (∗) де n ≥ 3, p ∈ Lloc(R₊; R₋), µ ∈ C(R₊; (0, +∞)), τ ∈ C(R₊; R₊), τ (t) ≤ t для t ∈ R₊ та limt→+∞ τ (t) = +∞. У випадку µ(t) ≡ const > 0 осциляцiйнi властивостi рiвняння (∗) було детально вивчено, тодi як у випадку µ(t) ≢ const, наскiльки вiдомо авторам, подiбнi питання не було розглянуто. У статтi наведено новi достатнi умови для того, щоб рiвняння (∗) мало властивiсть B

Stabilization by delay distributed feedback control

In this paper, a new approach to stability of integro-differential equations

About sign-constancy of Green's functions for impulsive second order delay equations

We consider the following second order differential equation with delay [formula] In this paper we find necessary and sufficient conditions of positivity of Green's functions for this impulsive equation coupled with one or two-point boundary conditions in the form of theorems about differential inequalities. By choosing the test function in these theorems, we obtain simple sufficient conditions. For example, the inequality [formula] is a basic one, implying negativity of Green's function of two-point problem for this impulsive equation in the case 0<γi≤1, 0<δi≤1 for i=1,…,p