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is λ the same as {λ}* ? are these expressions equal ?

@Kabir5454 $\lambda$ is used to denote empty string in Peter Linz’s book, we mostly use $\epsilon$ which Ullman uses in his book

It should be defined as people referring different books might get confused .

yes because epsilon means 0 length string and (epsilon)* means eps+(eps)1+(eps)2+....
which is epsilon only . therefore both are equal