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March 21st, 2009, 02:35 PM  #1 
Newbie Joined: Dec 2008 Posts: 4 Thanks: 0  fundamental group, free group
Let be the complement of the following subset of the plane Prove that is a free group on a countable set of generators. I don't know how to start this problem. I just need a few helpful hints. Thanks in advance. 

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free, fundamental, group 
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