Möbius function
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Möbius function
[′mər·bē·əs ‚fəŋk·shən] (mathematics)
The function μ of the positive integers where μ(1) = 1, μ(n) = (-1) r if n factors into r distinct primes, and μ(n) = 0 otherwise; also, μ(n) is the sum of the primitive n th roots of unity.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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