Article ID Journal Published Year Pages File Type
429920 Journal of Computer and System Sciences 2007 24 Pages PDF
Abstract

We consider words indexed by linear orderings. These extend finite, (bi-)infinite words and words on ordinals. We introduce finite automata and rational expressions for these words. We prove that for countable scattered linear orderings, these two notions are equivalent. This result extends Kleene's theorem.

Related Topics
Physical Sciences and Engineering Computer Science Computational Theory and Mathematics