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Revision as of 10:53, 23 November 2007
A dual of a logical statement is a sort of inversion of the statement.
Rigorous definition
Consider a logic statement 
. For each individual element or operator in , we replace:
(the universal 
(the 
with 
and vice versa.Such a statement is the dual of the statement. An interesting fact of logic is that if a logical statement is true, then its dual is true.
See Also
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