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edited | 35 views
+1

R' ∩ C' = ( R U C )' = C' ===> is it CFL closed under complementation? No ===> Is it CSL closed under Complementation? yes

therefore it must be CSL but it may or may not CFL

When CFL is DCFL then it is closed under complementation

L1=regular so L1(complement) is also regular as well as CFL.

L2=CFL so its complement will be CSL .now $L1\bigcap L2$ will be CSL not CFL
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it may be CFL

+1 vote