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direct sum
Word Origin
noun
Mathematics
.
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