de Morgan's Duality Law
For every proposition involving logical addition and multiplication ("or" and "and"), there is a corresponding proposition in which the words "addition" and "multiplication" are interchanged.
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de Morgan's Duality LawFor every proposition involving logical addition and multiplication ("or" and "and"), there is a corresponding proposition in which the words "addition" and "multiplication" are interchanged. Wolfram Web Resources
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{{2,-1,1},{0,-2,1},{1,-2,0}}.{x,y,z}