- A logic expression is a way of expressing a logic gate or logic circuit as an equation
- The output appears on the left of the equals sign with the inputs and logic gates on the right
Gate | Symbol | Truth Table | Logic Expression |
| NOT |  | AZ0110 | Z=NOT A |
| AND |  | ABZ000010100111 | Z=A AND B |
| OR |  | ABZ000011101111 | Z=A OR B |
| NAND |  | ABZ001011101110 | Z=A NAND B |
| NOR |  | ABZ001010100110 | Z=A NOR B |
| XOR |  | ABZ000011101110 | Z=A XOR B |
- Logic circuits containing multiple gates can also be expressed as logic expressions/statements
An example logic circuit containing two inputs
- The logic circuit above can be expressed as the logic expression Q= NOT(A OR B)
An example logic circuit containing two inputs
- The logic circuit above can be expressed as the logic expression Q= (NOT A) AND B
An example logic circuit containing three inputs
- The logic circuit above can be expressed as the logic expression P = ((NOT A) OR B) NAND C
An example logic circuit containing three inputs
- This logic circuit above can be expressed as X = NOT (A NAND B) OR (B NOR C)
