by Denis Th Erien, Thomas Wilke
http://www.cs.mcgill.ca/~denis/papers/master.ps
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Abstract:
We provide an effective characterization of the "until-since hierarchy " of linear temporal logic, that is, we show how to compute for a given temporal property the minimal nesting depth in "until " and "since " required to express it. This settles the most prominent classification problem for linear temporal logic. Our characterization of the individual levels of the "until-since hierarchy " is algebraic: for each n, we present a decidable class of finite semigroups and show that a temporal property is expressible with nesting depth at most n if and only if the syntactic semigroup of the formal language associated with the property belongs to the class provided. The core of our algebraic characterization is a new description of substitution in linear temporal logic in terms of block products of finite semigroups. 1
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