Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Real Analysis

We started metric spaces yesterday.  I am asked to prove that the metric space defined as P<x1,y1> and Q<x2,y2> is a metric space.  When I look at examples of these proofs they all say that the proof of the first properties (positive definiteness and symmetry) are trivial.  I think I must be more complete than that.  How do I best show that these properties are true for this space? 

Further, how do I show that the triangle inequality is true?   Do I create a new ordered pair and call it R<x3,y3> and then prove that the distance between P and Q is less than or equal to the distances from P to R + R to Q?

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