product of sums expression

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

The function is also realizable as the NOR of a group of NOR terms. See also standard product of sums, sum of products expression.