The Gateway to Computer Science Excellence
First time here? Checkout the FAQ!
x
+13 votes
387 views

02. Choose the correct alternatives (more than one may be correct) and write the corresponding letters only:

(xix) Context-free languages are

  1. closed under union
  2. closed under complementation
  3. closed under intersection
  4. closed under Kleene closure
     

 

asked in Theory of Computation by Veteran (68.8k points)
retagged by | 387 views

2 Answers

+13 votes
Best answer
Answer: A, D

Context Free languages are not closed under intersection and complementation.
answered by Veteran (35.8k points)
selected by
CFG are closed under Union , Kleen closure & Concatenation .

Also CFG are closed under Regular intersection

BUT , are CFG closed under Regular Union ?

I think yes...coz..every regular is CFG & CFG are closed under union ....

correct me if I am wrong
+1 vote

 

According to the above table we can say , A and D is correct answer

 

 

answered by Loyal (3.3k points)
wat is GSM mapping ??


Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

32,442 questions
39,188 answers
108,792 comments
36,561 users