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- W2256242912 abstract "Well-quasi-orderings (wqos) (Kruskal, 1972) are a fundamental tool in logic and computer science. They provide termination arguments in a large number of decidability (or finiteness, regularity, ...) results. In constraint solving, automated deduction, program analysis, and many more fields, wqo's usually appear under the guise of specific tools, like Dickson's Lemma (for tuples of integers), Higman's Lemma (for words and their subwords), Kruskal's Tree Theorem and its variants (for finite trees with embeddings), and recently the Robertson-Seymour Theorem (for graphs and their minors). What is not very well known is that wqo-based proofs have an algorithmic content. The purpose of these notes is to provide an introduction to the complexity-theoretical aspects of wqos, to cover both upper bounds and lower bounds techniques, and provide several applications in logics (e.g. data logics, relevance logic), verification (prominently for well-structured transition systems), and rewriting. Our presentation is largely based on recent works that simplify previous results for upper bounds (Figueira et al., 2011; Schmitz and Schnoebelen, 2011) and lower bounds (Schnoebelen, 2010a; Haddad et al., 2012), but also contains some original material." @default.
- W2256242912 created "2016-06-24" @default.
- W2256242912 creator A5042421707 @default.
- W2256242912 creator A5083815456 @default.
- W2256242912 date "2012-08-06" @default.
- W2256242912 modified "2023-10-07" @default.
- W2256242912 title "Algorithmic Aspects of WQO Theory" @default.
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