Let X = R? , and let d2 be the usual, Euclidean metric on X. Define another metric, d : X x X → R, by letting d(x, y) := max{|a1 – y1|, |#2 – Y2|} for any a, y E X. Which of the following statements is true? If a subset U CX is closed for the metric d, then it is also closed for the metric d2 d(x, y) < d2 (a , y) for all a, yEX, and hence if UC X is closed for d and VC X is closed for d2 then UC V. d(x, y) < d2 (x, y) for all x, yEX, and hence if UC X is closed for d and VC X is closed for d2 then V CU. d2 (x, y) < d(x, y) for all a, y E X, and hence if UC X is closed for d and VC X is closed for d2 then U C V.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
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Let X = R? , and let d2 be the usual, Euclidean
metric on X . Define another metric,
d : X x X → R , by letting
d(x, y) := max{|1 – Yı|, |æ2 – Y2|}
for any x, y E X. Which of the following
statements is true?
If a subset U CX is closed for the metric d , then
it is also closed for the metric d2 .
d(x, y) < d2 (x, y) for all x, y EX, and hence if
UCX is closed for d and VC X is closed for d2
, then UC V.
d(a, y) < d2 (x, y) for all x, yEX, and hence if
UC X is closed for d and VCX is closed for d2
then V CU.
d2 (x, y) < d(x, y) for all x, y E X, and hence if
UC X is closed for d and V C X is closed for d2
then U C V.
Transcribed Image Text:Let X = R? , and let d2 be the usual, Euclidean metric on X . Define another metric, d : X x X → R , by letting d(x, y) := max{|1 – Yı|, |æ2 – Y2|} for any x, y E X. Which of the following statements is true? If a subset U CX is closed for the metric d , then it is also closed for the metric d2 . d(x, y) < d2 (x, y) for all x, y EX, and hence if UCX is closed for d and VC X is closed for d2 , then UC V. d(a, y) < d2 (x, y) for all x, yEX, and hence if UC X is closed for d and VCX is closed for d2 then V CU. d2 (x, y) < d(x, y) for all x, y E X, and hence if UC X is closed for d and V C X is closed for d2 then U C V.
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