Let B denote the closed unit ball in a finite-dimensional normed linear space B = {x
Question:
B = {x ∊ X: ||x|| ≤ 1}
and let S denote its boundary, that is,
S = {x ∊ X: ||x|| ≤ 1}
There is no continuous function r: B → S such that r(x) = x for every x ∊ S.
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