**The following are the important postulates of Boolean algebra**:

1. 11 = 1 0+0 = 0.

2. 10 = 01 = 0 0+1 = 1+0 = 1.

3. 00 = 0 1+1 = 1.

4. 1 = 0 and 0 = 1.

Many theorems of Boolean algebra are based on these postulates, which can be used to simplify Boolean expressions. These theorems are discussed in the next section.