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The regular languages are not closed under ___________

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in Compiler by (36.6k points)
The regular languages are not closed under ___________

(a) Concatenation

(b) Union

(c) Kleene star

(d) Complement

This question was addressed to me in a job interview.

My question is based upon Non-Deterministic Finite Automata topic in chapter Finite Automata and Regular Expression of Compiler

1 Answer

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Best answer
Correct choice is (d) Complement

Easiest explanation: Explanation: RE are closed under

Union (cf. picture)

Intersection

Concatenation

Negation

Kleene closure.

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