i've got three regular expressions
a*(b U abb)b*b
a*b*b(a U (ab)*)*b*
(a U ab)(a* U ab)*b
and for each to find the shortest word, w µ[belongs] L(±)
for the first one i thought that the shortest word is bb and for the 2nd is a* but im not sure for the third one.
any thoughts on this ? or any corrections ?
Thanks in advance for any help !