AND as an inverted-input NOR — AND gate
exam standardthe alternative IEEE symbol
Answer
verified equivalent (both sides → A · B)
Why this example is worth doing
The De Morgan equivalent symbol for AND: a NOR body with bubbles on both inputs. It is the same physical function, drawn differently so that bubbles cancel against whatever drives it. Seeing the AND page carry an OR-shaped symbol is jarring the first time, which is the point — schematic reading requires recognising a gate by its bubble pattern rather than by its outline, and this page is where that habit starts.
Try your own input in the AND gate. Truth table, symbol and algebraic form for A·B, with a live two-input toggle.
How the answer is reached
The law
A · B(A′ + B′)′— Both sides have the same truth table over the union of their variables.
Truth table
| # | A | B | F |
|---|---|---|---|
| 0 | 0 | 0 | 0 |
| 1 | 0 | 1 | 0 |
| 2 | 1 | 0 | 0 |
| 3 | 1 | 1 | 1 |