1 votes 1 votes Concatenation of two different language cannot be commutative until atleast one of them is ‘Φ’ or ‘∈ True or false set2018 asked Dec 10, 2017 set2018 377 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Ashwin Kulkarni commented Dec 10, 2017 reply Follow Share I think it is false! L1= {a} L2 ={aa} L1.L2 = L2.L1 1 votes 1 votes Akash Mittal commented Dec 10, 2017 reply Follow Share let L1= {a} L2 ={aa} then L1.L2 = aaa = L2.L1 1 votes 1 votes Please log in or register to add a comment.