科研之友
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摘要
This paper is a survey on the equational descriptions of languages. The first part is devoted to Birkhoff%26apos;s and Reiterman%26apos;s theorems on equational descriptions of varieties. Eilenberg%26apos;s variety theorem and its successive generalizations form the second part. The more recent results on equational descriptions of lattices of languages are presented in the third part of the paper.
- 出版日期2012-9
