## sum of products

<*mathematics, logic*> Any mathematical expression in which
an addition operator is applied to two or more subexpressions
each of which is an application of a multiplication operator.
The most common case would be scalar addition and
multiplication, e.g.

ab + cdbut the term is used for other kinds of operators with similar properties, such as AND and OR in Boolean algebra, e.g.

(a AND b) OR (c AND d)<

*types*> algebraic data type.

Last updated: 2008-02-04

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