direct sum: Meaning and Definition of

direct' sum'

Pronunciation: [key]
— Math. Math.
  1. a composition of two disjoint sets, as vector spaces, such that every element in the composition can be written uniquely as the sum of two elements, one from each of the given sets.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
directrix direct tax
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