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Stands for equivalence regular expressions

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Reference no: EM132128553

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)∗

(c) (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.

Reference no: EM132128553

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