- #1

Applejacks

- 33

- 0

## Homework Statement

http://imageshack.us/photo/my-images/15/unledflsq.png/

## Homework 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.

## 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?