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Erschienen in:
2008 | OriginalPaper | Buchkapitel
Well Quasi-orders in Formal Language Theory
verfasst von : Flavio D’Alessandro, Stefano Varricchio
Erschienen in: Developments in Language Theory
Verlag: Springer Berlin Heidelberg
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The concept of well quasi-order is a generalization of the classical notion of well order and plays a role in the studying of several problems of Mathematics and Theoretical Computer Science. This paper concerns some applications of well quasi-orders to Formal Language Theory. In particular, we present a survey of classical and recent results, based upon such structures, concerning context-free and regular languages. We also focus our attention to some application of well quasi-orders in the studying of languages obtained by using the operators of shuffle and iterated shuffle of finite languages.