# Introduction to Boolean Algebra

Posted By on September 30, 2014

Boolean Algebra is used to analyze and simplify the digital (logic) circuits. It uses only the binary numbers i.e. 0 and 1. It is also called as Binary Algebra or logical Algebra. Boolean algebra was invented by George Boole in 1854.

## Rule in boolean algebra

Following are the important rules used in boolean algebra.

• Variable used can have only two values. Binary 1 for HIGH and Binary 0 for LOW.
• Complement of a variable is represented by a overbar (-). Thus complement of variable B is represented as . Thus if B = 0 then = 1 and B = 1 then = 0.
• ORing of the variables is represented by a plus (+) sign between them. For example ORing of A, B, C is represented as A + B + C.
• Logical ANDing of the two or more variable is represented by writing a dot between them such as A.B.C. Sometime the dot may be omitted like ABC.

#### Posted by Akash Kurup

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