Boolean NOT

To represent a NOT gate of A (in other words, invert the value of A), we put a line on top of the expression we want to invert:

\overline A

Or, for a longer expression (inverting A+B\cdot C):

\overline{A+B\cdot C}\oplus D

flashcards

Question	Answer
Boolean NOT	To invert a value A, we use \overline A.
Boolean NOT for long expressions	How do you invert a longer expression like A+B\cdot C? Use an overline over the whole expression, e.g. \overline{A+B\cdot C}.
Boolean NOT in complex expressions	What is the result of applying NOT to A+B\cdot C then XOR with D? \overline{A+B\cdot C}\oplus D