sum of products expression

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sum of products expression (SOP expression) A Boolean function expressed as a sum of product terms, i.e. as an OR of AND terms containing uncomplemented or complemented variables. An example is f = (xy′) ∨ (x′ ∧ z)

The function is also realizable as the NAND of a group of NAND terms. See also standard sum of products, product of sums expression.