Okay thanks even though (a+b)* will never be reached it could still form part of a valid input string!
Just checked tut 104 ... phew other answers i gave seemed ok, except for Question 5 which still have me bowled out for a duck!
must still check the other chap's solution diagram have not yet tried to trace through it.
After much battling with trying to understand how to determine what language is accepted by a TM and looking at ian's image.
Would I be wrong in saying that after the b at the end, you could still have some a's and the language would still be accepted by this TM:
So, shouldn't it be:
a(aa)*b(ab +aaab)*
Was wondering why the last set (i.e. (ab + aaab)*) would not be included?