- #1
Bashyboy
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- 5
Homework Statement
I am trying to show that ##X = \{z : |z| \le 1 \} \cup \{z : |z-2|<1\} \subset \mathbb{C}## is a connected set.
Homework Equations
Definition of connectedness that I am working with: A metric space ##(X,d)## is connected if the only subsets of ##X## that are both open and closed are ##\emptyset## and ##X##. If ##A \subseteq X##, then ##X## is connected if ##(A,d)## is connected
The Attempt at a Solution
I have been staring at this problem for quite some time and I don't really have much:
Let ##C \subseteq X## be nonempty and both closed and open. I want to show that ##X \subseteq C##. Let ##z \in X = C \cup (X-C)##. Then either ##z \in C##, in which case we are done, or ##z \in (X-C)##...I would like to show that the latter case implies a contradiction, but I am having difficulty.
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