Long words: the theory of concatenation and &ohgr;-power
Theoretical Computer Science
Hierarchy Among Automata on Linear Orderings
TCS '02 Proceedings of the IFIP 17th World Computer Congress - TC1 Stream / 2nd IFIP International Conference on Theoretical Computer Science: Foundations of Information Technology in the Era of Networking and Mobile Computing
Deciding whether the frontier of a regular tree is scattered
Fundamenta Informaticae
Automata logics, and infinite games: a guide to current research
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A Mezei-Wright theorem for categorical algebras
Theoretical Computer Science
Closures in Binary Partial Algebras
Electronic Notes in Theoretical Computer Science (ENTCS)
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Courcelle introduced the study of regular words, i.e., words isomorphic to frontiers of regular trees. Heilbrunner showed that a nonempty word is regular if it can be generated from the singletons by the operations of concatenation, omega power, omega-op power, and the infinite family of shuffle operations. We prove that the algebra of nonempty regular words on the set A, equipped with these operations, is freely generated by A in a variety which is axiomatizable by an infinite collection of some natural equations. We also show that this variety has no finite equational basis and that its equational theory is decidable in polynomial time.