"268656" . . . . "International Journal of Foundations of Computer Science" . "Literally idempotent languages and their varieties - two letter case" . . . . . "2"^^ . "RIV/00216224:14310/10:00047227" . . "SG - Singapursk\u00E1 republika" . . . "000282583600006" . "Literally idempotent languages and their varieties - two letter case"@en . "varieties of regular languages; idempotent semigroups; syntactic monoids"@en . "We already studied classes of literally idempotent languages closely related to the (positive) varieties of the famous Straubing- Th\u00E9rien 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."@en . "21" . . "Kl\u00EDma, Ond\u0159ej" . "2"^^ . "We already studied classes of literally idempotent languages closely related to the (positive) varieties of the famous Straubing- Th\u00E9rien 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." . "0129-0541" . "Literally idempotent languages and their varieties - two letter case" . "[6F54AB41B1B3]" . "5" . "Literally idempotent languages and their varieties - two letter case"@en . . . . . "P(1M0545), P(GA201/09/1313), Z(MSM0021622409)" . . . . . "20"^^ . "RIV/00216224:14310/10:00047227!RIV11-GA0-14310___" . "Pol\u00E1k, Libor" . "14310" .