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SETS, De Morgan's laws, Origin, Basic operations, What is set?, …
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De Morgan's laws
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If A and B are any two sets then,
(A ∪ B)′ = A′ ∩ B′
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Origin
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The German word Menge, rendered as "set" in English
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Basic operations
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Intersections
The intersection of A and B, denoted by A ∩ B
Example
{1, 2} ∩ {1, 2} = {1, 2}.
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