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A metric space is a set with a global distance function (the metric ) that, for every two points in , gives the distance between them as a nonnegative real number . A metric space must also satisfy
1. iff ,
2. ,
3. The triangle inequality .
REFERENCES:
Munkres, J. R. Topology: A First Course, 2nd ed. Upper Saddle River, NJ: Prentice-Hall, 2000.
Rudin, W. Principles of Mathematical Analysis, 3rd ed. New York: McGraw-Hill, 1976.
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