- #1
gottfried
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Homework Statement
Let K ={(x,y)[itex]\in[/itex]ℝ2:|x|≤1,|y|≤1}
Prove that K is a connected subset of ℝ2
The Attempt at a Solution
Suppose f:[-2,2]→K and define f(x)={(x,y):|y|≤1}
Dist(f(x),f(y))=sup(d(a,b):a[itex]\in[/itex]f(x),b[itex]\in[/itex]f(y))=d(x,y)=|x-y|. Using this equality it is easily shown that f(x) is continuous.
So f is continuous and [-2,2] is connected therefore f([-2,2])=k is connected.
Proving things are connected is very difficult and was just wondering if my proof was vaguely correct?