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SOME IMPORTANT POINTS OF LANGUAGE:

 

If L = ɸ then  = {λ}

ϕ0 =  λ

 

Example:

L1= {λ, a, b} 

L2 = {λ , a}

 

Example:

L = ɸ = { }

L0= λ ,  ϕ0 = { }0 = λ

 

As we know {λ} ∪ { } = {λ}