Answer
$ D(P,r)$ is the disk centered at $ P $ but $ D^*(P,r)$ is the punctured disk which does not include $ P $.
Work Step by Step
Given above.
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 15 - Differentiation in Several Variables - 15.2 Limits and Continuity in Several Variables - Preliminary Questions - Page 771: 1
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