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| Teaching Since: | May 2017 |
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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
For another interesting example, let X = R2 and define d1 by
Â

where the inequality comes from the triangle inequality for absolute value [Theorem 2.9(d)]. Geometrically, the neighborhoods in this metric are diamond shaped. [See Figure 2(b).] If (X,d) is a metric space, then we can use Definition 6.3 for neighborhoods to characterize interior points, boundary points, open sets, and closed sets, just as we did in Section 4 for R. The theorems from Section 4 that relate to these concepts also carry over to this more general setting with little or no change in their proofs. One result that should not be unexpected but that requires a new proof is the following theorem.
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