Let n e N, let a e R, let s,re R with s...
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Let n e N, let a e R", let s,re R with s <r, and set V = {1E R" : s < ||I - a|| < r} and E = {* € X:s < I- a|| <r}. %3D Prove that V is open andE is closed. Let n e N, let a e R", let s,re R with s <r, and set V = {1E R" : s < ||I - a|| < r} and E = {* € X:s < I- a|| <r}. %3D Prove that V is open andE is closed.
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