Duduli

It states that “the complement of the wholesum is equal to the product of individual complements & vice versa. I.e  (A+B)' = A'.B'[de Morgan's 1st theorem] Similarly    (A.B)' = A'+B' [de Morgan's 2nd theorem]

The sum of products form of a boolean expression consists of two or more AND terms (i.e products) that are ORed together.    e.g AB+CD, ABC+A'BC’ etc.

It is the set of rules used to simplify the given logic expression without changing it's functionality. It is used when number of variables are less. Boolean algebra differs from ordinary algebra in that boolean constants and variables can have only two values 0 & 1.

The duality principle states that a boolean expression remains valid if operators OR & AND are interchanged and 1's & 0's in the expression are also interchanged.