1. The problem statement, all variables and given/known data http://imageshack.us/photo/my-images/15/unledflsq.png/ 2. Relevant equations A simply connected domain D in the complex plane is an open and path connected set such that every simple closed path in D encloses only points of D. 3. The attempt at a solution The answers are a,c and d.I don't understand why they all aren't simply connected. They are all path connected and open. Am I misunderstanding the definition of open?