39b82 - Open Access .click

International Journal of Mathematical Analysis, 2021
The general quintic functional equation is a generalization of many functional equations such as the additive, the general quadratic, the general cubic, and the general quartic functional equation.
S. Jin, Yang-Hi Lee
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An Instructive Treatment of a Generalization of Găvruţă’s Stability Theorem

Sarajevo Journal of Mathematics
We prove several useful theorems on Hyers sequences and their pointwise limits in quite natural ways which make a straightforward generalization of Găvruţă''s stability theorem rather plausible. 2000 Mathematics Subject Classification.
Ester Gselmann, Á. Száz
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Remark on the Second Bounded Cohomology of Amalgamated Product of Groups

Sarajevo Journal of Mathematics
For any cardinal number ${\mathcal M}$ we construct examples of amalgamated products and HNN extensions of groups such that the dimension of the space of second bounded cohomologies is at least ${\mathcal M}$.
V. A. Faĭziev, Prasanna K. Sahoo
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Stability of $n$-th Order Flett's Points and Lagrange's Points

Sarajevo Journal of Mathematics
In this article we show the stability of Flett's points and Lagrange's points in the sense of Hyers and Ulam. 2000 Mathematics Subject Classification.
Iwona Pawlikowska
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mathematics
39b52
hyers-ulam stability

39b72
47h10
quadratic functional equation

hyperstability
hyers-ulam-rassias stability
fixed point theorem