DeMorgan’s first Theorems
• The complement of a product of variables is equal to
the sum of the complements of the variables
• The
formula for expressing this theorem for two variables is:
(XY)’ = X’ + Y’
DeMorgan’s second theorem
• The complement of a sum of variables is equal to the
product of the complements of the variables
• The formula for expressing
this theorem for two variables is:
(X+Y)’ = X’Y’
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