Question

Working with set builder notation, what does L = {w ϵ {a, b}* : x ϵ {a, b}+ (w = axa)} mean in plain english?

Answer 1

here's what i have so far a. The language L consists of all words which are combinations of the symbols ‘a’ and ‘b’. If a word in L contains at least one ‘a’ and one ‘b’, it must begin with ‘a’ and end with ‘a’.