= Generalized star-height problem
{wiki=Generalized_star-height_problem}
The Generalized star-height problem is a significant question in the fields of automata theory and formal language theory, particularly dealing with regular languages and the expressiveness of various types of grammars and automata. Star height, in this context, refers to a measurement of the complexity of regular expressions based on the number of nested Kleene stars (denoted by the asterisk symbol '*') that are present in the expression.
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