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Star height problem: Computing the star height of regular languages, Families of regular languages with unbounded star height & Overview
The star height problem in formal language theory is the question whether all regular languages can be expressed using regular expressions of limited star height, i.e. with a limited nesting depth of Kleene stars. Specifically, is a nesting depth of one always sufficient? If not, is there an algorithm to determine how many are required? The problem was…
Language: English [EN]
