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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

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Context Free languages are not closed under intersection and complementation.

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

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wat is GSM mapping ??
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Gsm mapping Short for generalized sequential machine mapping. A function that is the response function of a generalized sequential machine, and therefore generalizes the notion of sequential function. Without constraining the machine to have a finite state-set, generalized sequentiality is equivalent to the following property of initial subwords preservation

for all u,v in I*, f(uv) has the form f(u)w for some w in O*, where I* and O* are the sets of all input and output strings.