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How dual and complement different from each other
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As per Morris Mano

In Dual of a function We change 0 to 1 and 1 to 0 replace every AND by Or and Every Or by AND

In compliment of a function We change 0 to 1 and 1 to 0 replace every AND by Or and Every Or by And and also compliment each literal.

An dual of a function can be that function itself such functions are Know as self dual function but on other hand self complementing function does not exist.

Dual of 0 is 1, Compliment of 0 is 1

Dual of AB is A+B, Compliment of AB is (~A+~B)

let F(A,B,C)= AB+BC+CA Dual of this is the function itself. i.e Dual of F(A,B,C)=AB+BC+CA.
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In dual we convert 0 to1..1 to 0...and to or and or to and.. While variable remains same

In complement we change variable to its negation form
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for complement we change literals like a to ~a and ~a to a and + to . and . to +

for dual we will change only . to + and + to . keeping the literals same.

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