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Let $Q_r = \{ z=x+iy : x,y \in (-r,r) \} \subseteq \mathbb C$

Show that $Q_4 \backslash Q_1$ isn't simply connected domain.

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    Welcome to MSE bond =) just a tip for asking questions in the future : Try not asking questions with an imperative attitude, you are not a math manual and we are not a solution manual. Being more friendly makes it more human. Also, try explaining why you're having trouble with this question : if you write what you've tried we're more willing to help.2011-11-22
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    Grammar (such as use of the imperative mood) is irrelevant. The relevant criticism is that the question consists of the text of an exercise _without any thoughts of the asker's own added_. That's not good, but it is independent of what grammatical mood is used. Rewriting the question to use different grammar without adding any independent work or thoughts wouldn't solve anything.2011-11-22

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