i) Pe(x) = 0 iff r € Ë. ii) Prove that pe is uniformly continuous.

Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter9: Multivariable Calculus
Section9.2: Partial Derivatives
Problem 48E
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b)Let E be a non-empty subnset of a metric space(X,d),define the distance of x from
E by: ρE(x)=inf∈Ed(x,z).

i) Pe(x) = 0 iff z € Ë.
ii) Prove that pe is uniformly continuous.
c) Which of the following functions define a metric on R. Justify your answer. (
i) D:(u, v) = (u – v)²
ii) D2(u, v) = V[u – v[
|u – v|
iii) D3(u, v) =
%3D
1+ |u + v|
Transcribed Image Text:i) Pe(x) = 0 iff z € Ë. ii) Prove that pe is uniformly continuous. c) Which of the following functions define a metric on R. Justify your answer. ( i) D:(u, v) = (u – v)² ii) D2(u, v) = V[u – v[ |u – v| iii) D3(u, v) = %3D 1+ |u + v|
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