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Show that there is no retraction from the closed interval [-1,1] onto the two point set {-1,1}

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New member
Oct 15, 2013
19
Is anyone can help me to Show that there is no retraction from the closed interval [-1,1] onto
the two point set {-1,1}

I think we can show this by contradiction, however, I really confused about the definition of retraction.

Thanks
 
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