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Abstract and Applied Analysis
Volume 2013, Article ID 401756, 13 pages
Review Article

Hyperstability and Superstability

Department of Mathematics, Pedagogical University, Podchorążych 2, 30-084 Kraków, Poland

Received 31 August 2013; Accepted 26 October 2013

Academic Editor: Bing Xu

Copyright © 2013 Janusz Brzdęk and Krzysztof Ciepliński. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This is a survey paper concerning the notions of hyperstability and superstability, which are connected to the issue of Ulam’s type stability. We present the recent results on those subjects.