Peter Linz Exercise 2.1 question 21

Question

L = $\left \{a^{*}b \right \}$

what is $L^{2} - L $

Comments

a*ba*b?

---

i think the answer by shivanisrivarshini  is correct

---

i have written the same :P

---

oh yeah i misread :p

Answer 1

L = {a*b} has exactly one b in each string

L² ={a*b}{a*b} has exactly 2 b's in each string

L² and L has no common strings

So L² - L = L² ={a*b}{a*b} 

Comments

i was getting the same but was confused :) thanks