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"Principal of Duality"
According to principle of duality "Dual of one expression is
obtained by replacing AND (.)with OR(+) and OR with AND together with replacement of 1 with 0 and
0 with 1.
For example: consider the expression A+B=0. The dual of this expression is obtained by replacing + with . and 0 by 1.
i.e., A.B=1 is dual of A+B=0