On a previous homework, you proved a Bolzano-Weirstrass theorem for ℝ3 with the metric d((x1, x2, x3), (y1, y2, y3) = |x1 - y1| + |x2 - y2| + |x3 - y3|. Conclude that, with this metric, a subset of ℝ3 is sequentially compact if and only if it is closed and bounded

On a previous homework, you proved a Bolzano-Weirstrass theorem for ℝ3 with the metric d((x1, x2, x3), (y1, y2, y3) = |x1 - y1| + |x2 - y2| + |x3 - y3|. Conclude that, with this metric, a subset of ℝ3 is sequentially compact if and only if it is closed and bounded

Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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Question

On a previous homework, you proved a Bolzano-Weirstrass theorem for ℝ³ with the metric

d((x₁, x₂, x₃), (y₁, y₂, y₃) = |x₁ - y₁| + |x₂ - y₂| + |x₃ - y₃|.

Conclude that, with this metric, a subset of ℝ³ is sequentially compact if and only if it is closed and bounded.

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