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The asymptotic behaviour of a Sturm-Liouville differential equation with coefficient $λ^{2} q (s), s \in [s_{0}, \infty)$ is investigated, where $λ \in ℝ$ and $q (s)$ is a nondecreasing step function tending to $\infty$ as $s \to \infty$ . Let $S$ denote the set of those $λ$ ’s for which the corresponding differential equation has a solution not tending to 0. It is proved that $S$ is an additive group. Four examples are given with $S = {0}$ , $S = ℤ$ , $S = 𝔻$ (i.e. the set of dyadic numbers), and $ℚ \subset S ⫋ ℝ$ .

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Addenda to “Periodic solutions of $x " + f (x) x^{' 2 n} + g (x) = 0$ with arbitrarily large period”

Addendum and corrigendum to the paper "Some applications of Zygmund's lemma to non-linear differential equations in Banach and Hilbert spaces" (Studia Math., 44 (1972), pp. 335-344)

Addendum to a paper of Craig and Goodman.

Addendum to: “Alternative analysis generated by a differential equation”.

Addendum to asymptotic stability in differential equations with unbounded delay.

Addendum to "On Meromorphic Solutions of Algebraic Differential Equations".

Addendum to periodic solutions of a third-order nonlinear differential equation

Addendum to the paper: “Some fixed point theorems for multivalued mappings”

Addition à un mémoire sur les équations différentielles linéaires

Addition theorems for solutions to linear homogeneous constant coefficient ordinary differential equations. (Short Communication).

Addition theorems for solutions to linear homogeneous constant coefficient ordinary differential equations.

Additions To Kamke's Treatise II: Nonlinear First And Second Order Differential Equations

Additions to Kamke's treatise VI: A nonlinear second order equation.

Additive groups connected with asymptotic stability of some differential equations

Adiabatic theory : stability of systems with increasing gaps

Adjoint and self-adjoint differential operators on graphs.

Adjoint differential inclusions in necessary conditions for the minimal trajectories of differential inclusions

Adjoint domains and generalized splines

Adjoint operators and boundary value problems for linear differential equations

Adjoints of solution semigroups and identifiability of delay differential equations in Hilbert spaces.

Currently displaying 601 – 620 of 9351