The AND gate

The AND gate with two-input (A,B), one output (Y).

The AND gate reminds us of an electrical circuit with 2 switches A, B and 1 light bulb Y.

Y=TRUE if and only if both A and B are TRUE. Otherwise, the output is FALSE.

The Boolean equation for an AND gate can be written in several ways:

Y = A • B; Y = AB; Y = A^B; Y = A ∩ B.

These operators are also known by names: “phép nhân”, “phép tính hội”.

We use Y = AB for simplicity.