How to remember Closure table

Question

Comments

Sir , I know all the closure properties of Regular , CSL , Rec  and RE  but for DCFL and CFL , I forget some properties many times.. but no problem but I will remember it :) ... I was just asking to know  how people remember it easily..

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Well I do not remember it easily- rather I only remember the easy ones :) Only a few GATE questions can be solved using closure properties. I know that complement of CFL may not always be CFL - this is not because I studied the closure property but because I have seen many examles like that.

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Yes sir , It is correct by doing more and more examples ,   properties will be remembered automatically... Thanks sir for your response.. :)

Answer 1

It will be easy to remember only the not closed once. If you consider only Reg CFL Recursive Recursive enumerable and all basic property then only cfl not closed under intersection and complementation and RE is not closed under complementation.