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root of unity[¦rüt əv ′yü·nəd·ē]
A root of unity in a field F is an element a in F such that a n = 1 for some positive integer n.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The cube roots of unity
, equally spaced at 120[degrees] intervals around the unit circle centred at the origin, is arguably the best known illustration of this fact.