From the text: This is the second special volume of the journal Abstract and Applied Analysis that is focused on Ulam’s type stability. Let us remind that the investigation of the issue of that type of stability has been motivated by one of the problems posed by S. M. Ulam in 1940 (the one concerning approximate homomorphisms). Nowadays, it is an expanding area of research, which concerns various types of equations and inequalities (difference, functional, differential, and integral) and some other mathematical objects, as well.
This volume includes 14 research articles (a survey and 13 regular papers) containing the latest achievements in that type of stability.