Yes, decidable languages are closed under operations such as union, intersection, concatenation, and complementation. This means that if a language is decidable, performing these operations on it will result in another decidable language.
Yes, decidable languages are closed under concatenation.
Yes, decidable languages are closed under intersection.
Decidable languages are closed under union, intersection, concatenation, and Kleene star operations. This means that if two languages are decidable, their union, intersection, concatenation, and Kleene star are also decidable.
Yes, recognizable languages are closed under concatenation.
No, the class of recognizable languages is not closed under complementation.
Yes, decidable languages are closed under concatenation.
Yes, decidable languages are closed under intersection.
Yes, recognizable languages are closed under concatenation.
No, the class of recognizable languages is not closed under complementation.
No, the class of undecidable languages is not closed under complementation.
No, the set of nonregular languages is not closed under intersection.
Yes, Turing recognizable languages are closed under concatenation.
Yes, Turing recognizable languages are closed under intersection.
Yes, Turing recognizable languages are closed under union.
Yes, context-free languages are closed under concatenation.
None.
Yes. The empty set is closed under the two operations.