extreme point(redirected from Extremal set)
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extreme point[ek′strēm ′pȯint]
A maximum or minimum value of a function.
A point in a convex subset K of a vector space is called extreme if it does not lie on the interior of any line segment contained in K.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.