Mathissen, Christian - Weighted Logics for Nested Words and Algebraic Formal Power Series

lmcs:854 - Logical Methods in Computer Science, February 19, 2010, Volume 6, Issue 1
Weighted Logics for Nested Words and Algebraic Formal Power Series

Authors: Mathissen, Christian

Nested words, a model for recursive programs proposed by Alur and Madhusudan, have recently gained much interest. In this paper we introduce quantitative extensions and study nested word series which assign to nested words elements of a semiring. We show that regular nested word series coincide with series definable in weighted logics as introduced by Droste and Gastin. For this we establish a connection between nested words and the free bisemigroup. Applying our result, we obtain characterizations of algebraic formal power series in terms of weighted logics. This generalizes results of Lautemann, Schwentick and Therien on context-free languages.


Source : oai:arXiv.org:1001.2175
DOI : 10.2168/LMCS-6(1:5)2010
Volume: Volume 6, Issue 1
Published on: February 19, 2010
Submitted on: December 8, 2008
Keywords: Computer Science - Logic in Computer Science,F.1.1,F.1.2,F.4.1,F.4.3


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