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## Homework Statement

I need to prove this

http://www.freeimagehosting.net/newuploads/66exd.jpg

R represents the reversal of...L1 and L2 represent languages, which can represent strings.

(L1L2) = the concatenation of L1 and L2

Ex.

L1 = 01001

L2 = 001

L1L2 = 01001001

(L1L2)^R = 10010010

## The Attempt at a Solution

Let y be a member of E* denote an arbitrary string in the set (L1L2)^R.

This is where I'm stuck...