
noun:
 a union of two disjoint units where every factor could be the amount of a component from each one of the disjoint establishes
 a union of two disjoint sets which every element could be the sum of a feature from each of the disjoint sets
 a union of two disjoint units where every element is the sum of an element from each one of the disjoint establishes
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Hypernym for "direct sum"
 union
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How would you define direct sum?