Publication details

Literally idempotent languages and their varieties - two letter case

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KLÍMA Ondřej POLÁK Libor

Year of publication 2010
Type Article in Periodical
Magazine / Source International Journal of Foundations of Computer Science
MU Faculty or unit

Faculty of Science

Field General mathematics
Keywords varieties of regular languages; idempotent semigroups; syntactic monoids
Description We already studied classes of literally idempotent languages closely related to the (positive) varieties of the famous Straubing- Thérien hierarchy. In the present paper we start a systematic study of literal varieties of literally idempotent languages, namely we deal with the case of two letter alphabet. First, we consider natural canonical expressions for such languages. Secondly, we describe all possible classes of the form V ({a, b}) where V is a literal variety of literally idempotent languages.
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