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De Morgan's theorem may be applied to the negation of a disjunction or the negation of a conjunction in all or part of a formula. Negation of a disjunction ... Computer programmers use them to simplify or properly negate complicated logical conditions. - read more

DeMorgan's theorem may be thought of in terms of breaking a long bar symbol. When a long bar is broken, the operation directly underneath the break changes from addition to multiplication, or vice versa, and the broken bar pieces remain over the individual variables. - read more

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