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direct sum

See more synonyms for direct sum on Thesaurus.com
noun Mathematics.
  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.
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Origin of direct sum

First recorded in 1925–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018