As the title says, why a spiral is the deformation retract of a plane?.
Why a spiral is the deformation retract of a plane?
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general-topology
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0I'm sorry I do not describe it clearly. Yes, it is an ordinary one-armed Archimedean spiral including the center point. I think it is easy to see that a plane can retract to a spiral without the center.But with a center, I find it not easy.. – 2011-10-29