D. Popa

activity

20102026

collaborators

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3 papers · 1 filter

math.FA2020

On the best Ulam constant of a higher order linear difference equation

Alina Ramona Baias, Dorian Popa

In a Banach space $X$ the linear difference equation with constant coefficients $x_{n + p} = a_{1} x_{n + p - 1} + \dots + a_{p} x_{n},$ is Ulam stable if and only if the roots $r_{k},$ $1\leq k\l…

math.FA2015

On the stability of the linear functional equation in a single variable on complete metric groups

Soon-Mo Jung, Dorian Popa, Michael Th. Rassias

In this paper we obtain a result on Hyers-Ulam stability of the linear functional equation in a single variable $f (φ (x)) = g (x) \cdot f (x)$ on a complete metric group.

math.FA2010

On the stability of the first order linear recurrence in topological vector spaces

Mohammad Sal Moslehian, Dorian Popa

Suppose that $X$ is a sequentially complete Hausdorff locally convex space over a scalar field $K$ , $V$ is a bounded subset of $X$ , $(a_{n})_{n \geq 0}$ is…