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View article: Easy-to-Read: Evolution and Perspectives—A Bibliometric Analysis of Research, 1978–2021
Easy-to-Read: Evolution and Perspectives—A Bibliometric Analysis of Research, 1978–2021 Open
The purpose of this paper is to observe the use of the Easy-to-Read term in the international scientific literature. Therefore, a bibliometric analysis was carried out using the Web of Science database, focusing on the period between 1978 …
View article: Fixed points and the stability of the linear functional equations in a single variable
Fixed points and the stability of the linear functional equations in a single variable Open
We prove that an interesting result concerning generalized Hyers-Ulam-Rassias stability of a linear functional equation obtained in 2014 by S.M. Jung, D. Popa and M.T. Rassias in Journal of Global Optimization is a particular case of a fix…
View article: Ulam Stability of a Second Linear Differential Operator with Nonconstant Coefficients
Ulam Stability of a Second Linear Differential Operator with Nonconstant Coefficients Open
In this paper, we obtain a result on Ulam stability for a second order differential operator acting on a Banach space. The result is connected to the existence of a global solution for a Riccati differential equation and some appropriate c…
View article: Survey on Recent Ulam Stability Results Concerning Derivations
Survey on Recent Ulam Stability Results Concerning Derivations Open
This is a survey presenting the most significant results concerning approximate (generalized) derivations, motivated by the notions of Ulam and Hyers-Ulam stability. Moreover, the hyperstability and superstability issues connected with der…