# Boolean Algebra, Duality Principle and `Huntington postulates.`

Lets start our Bollean Algebra discussions with Duality Principle:

The duality **property** of Boolean algebra state that all binary expressions remain valid when following two steps are performed:

Step 1 : Interchange OR and AND operators.

Step 2 : Replace all 1’s by 0’s and 0’s by 1’s.

Next lets discuss** Huntington Postulates**

**P1**. Postulate:-

`Next`

From duality of P1

**P2**. Postulate:-

Sum of a number and its complement from a Set is ‘1’.