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## English | ||
* _Kleene closure_; _Kleene star_; _reflexive and transitive closure_ | ||
* Symbol: `*` | ||
* Definition: a metasyntactic sugar for repetition: `x*` means that `x` can be repeated zero or more times. The language that the Kleene star generates, is a monoid with concatenation as the binary operation and [[epsilon]] as the [[identity element]]. | ||
* Wikipedia: http://en.wikipedia.org/wiki/Kleene_star | ||
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## Russian | ||
* _замыкание Клини_; _звезда Клини_; _рефлексивно-транзитивное замыкание_ | ||
* Definition: вспомогательная метаязыковая конструкция: `x*` означает повторение `x` ноль или более раз. Порождаемый звездой язык образует [[моноид]] по конкатенации с [[нейтральным элементом|нейтральный элемент]] [[эпсилон]]. Таким образом, определение распространяется на любой моноид. | ||
* Wikipedia: http://ru.wikipedia.org/wiki/Звезда_Клини | ||
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## German | ||
* _Kleenesche Hülle_; _endlicher Abschluss_; _Kleene-*-Abschluss_; _Verkettungshülle_; _Kleene-Stern_ | ||
* Wikipedia: http://de.wikipedia.org/wiki/Kleenesche_und_positive_Hülle |