Negation is quite useful. In addition to the three two-input gates already
discussed (AND, OR, and XOR), three more are commonly available. These
are identical to AND, OR, and XOR, except that the gate output has been negated. These gates are called the NAND (“not AND”), NOR (“not OR”),
and NXOR (“not exclusive OR”) gates. Their symbols are just the symbols
of the unnegated gate with a small circle drawn at the output:
discussed (AND, OR, and XOR), three more are commonly available. These
are identical to AND, OR, and XOR, except that the gate output has been negated. These gates are called the NAND (“not AND”), NOR (“not OR”),
and NXOR (“not exclusive OR”) gates. Their symbols are just the symbols
of the unnegated gate with a small circle drawn at the output:
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