We give a new proof that the polynomial closure of a lattice of regular languages closed under quotient is also closed under intersection. 2. We prove a
languages are classes of recognizable languages closed under finite boolean. *LITP/IBP Université Paris VI et CNRS
order logic: it is about the class of star-free languages. This is the smallest class of languages containing all finite languages and closed under boolean
linear context-free language ~s a homomorphic replication of type p of some regular set. Thus the class of regular sets ts not closed under homomorphic
22 nov. 2008 and Priestley duality. Let us call lattice of languages a class of regular languages closed under finite intersection and finite union.
a Boolean algebra) of regular languages closed under quotients. Equations with zero. The existence of a zero in a syntactic monoid is given by the equations:.
Recall that a formation of groups is a class of finite groups closed under taking quotients and subdirect products. This question was motivated by the
23 déc. 2015 languages and varieties of finite semigroups or finite monoids. Varieties of languages are classes of recognizable languages closed under ...
27 janv. 2018 Similarly C is said to be closed under Boolean operations if