Let be a Sigma Algebra , and let and be Measures on . If there Exists a pair of disjoint Sets and such that is Concentrated on and is Concentrated on , then and are said to be mutually singular, written .

**References**

Rudin, W. *Functional Analysis, 2nd ed.* New York: McGraw-Hill, p. 121, 1991.

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1999-05-26