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direct sum

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.
Origin of direct sum
1925-1930
First recorded in 1925-30
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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