(Answered) Determine whether or not the following claim is true for

Management Studies

Determine whether or not the following claim is true for all regular expressions r1 and r2. The symbol ≡ stands for equivalence regular expressions in the sense that both expressions denote the same language.

(a) (r1*)* ≡ r1*

(b) r1*(r1 + r2)∗ ≡ (r1 + r2)∗

(d) (rs +r)*r = r(sr + r)*

All of the above true, I need proofs that I can understand and apply to similar questions.

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