Oh, I don't believe, I have done A3. I still have some questions. In Q2, where you are offered to prove/disprove 4 statements, could I use the fact mentioned in the book without proving it or I have to prove it? : (1+0)* = (1*0*)*. Because in this case R2 = R4: R2 = (0 + (10*1))* = (0*(10*1)*)* = R4. And then only one statement can be proved and another will be proven automatically.
To be on the safe side, I decided to prove both.
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