Descartes' rule of signs

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Descartes' rule of signs

[dā′kärts ′rül əv ′sīnz]
(mathematics)
A polynomial with real coefficients has at most k real positive roots, where k is the number of sign changes in the polynomial.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.