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# Augustus De Morgan

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Augustus De Morgan was an Indian-born British mathematician and logician?. He was born in 1806 and died in 1871. He proved an important result that [set intersection]? and [set union]? were dual? under complementation?.

  ie: complement( S intersect T ) == complement(S) union complement(T)
  and complement( S union T ) == complement(S) intersect complement(T)

[Charles Peirce]? showed that this result appled to logical and for intersect, logical or for union, and logical negation for complement.

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Last edited August 16, 2001 5:39 pm (diff)
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