Prove that if U and V are neighborhoods of x e R", then so are Un V and U U V.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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Prove that if U and V are neighborhoods of x e R",
then so are Un V and U U V.
Transcribed Image Text:Prove that if U and V are neighborhoods of x e R", then so are Un V and U U V.
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Step 1

A set A is said to be neighborhood of a point xn , if there exist a positive real number r>0, such that the open ball Bx,r centered at xn, and radius r>0 is completely lies on the set A. That is Bx,rA.

Given that U and V are neighborhoods of xn. Consider the set UV.

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