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Boolean algebra: DeMorgan’s theorem

DeMorgan’s theorem
A + B = A ∙ B
A + B + C + … + Z = A ∙ B ∙ C ∙ … ∙ Z
A ∙ B = A + B
A ∙ B ∙ C ∙ … ∙ Z = A + B + C + … + Z

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