What is a NOT gate and how is it represented in Boolean logic?

The NOT gate can be represented using various symbols and notations in Boolean logic. The most common symbols used to represent a NOT gate are:

The standard symbol:

css

Copy code

Input ----| NOT |---- Output

The symbol with a small circle at the output:

mathematica

Copy code

Input ----| NOT |O---- Output

The symbol with a small circle at the input:

mathematica

Copy code

Input O----| NOT |---- Output

The Boolean expression for a NOT gate can be written using logical notation as follows:

Output = NOT(Input) = ~Input

Here, "~" represents the NOT operation.

The truth table for a NOT gate is as follows:

Input Output

0 1

1 0

NOT gates are fundamental building blocks in digital circuits and play a crucial role in performing logical operations and signal inversion. They are often used in combination with other logic gates to create more complex logic functions and circuits.