Oct 15, 2013 Thread starter #1 S smile 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 Last edited: Oct 15, 2013
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