NOR

Not OR.

The Boolean function which is true if none of its inputs are true and false otherwise, the logical complement of inclusive OR. The binary (two-input) NOR function can be defined (written as an infix operator):

A NOR B = NOT (A OR B) = (NOT A) AND (NOT B)

Its truth table is: 

 A | B | A NOR B
 --+---+---------
 F | F |    T
 F | T |	   F
 T | F |    F
 T | T |    F
NOR, like NAND, forms a complete set of Boolean functions on its own since it can be used to make NOT, AND, OR and any other Boolean function:

NOT A = A NOR A

A OR B = NOT (A NOR B)

A AND B = (NOT A) NOR (NOT B)

Last updated: 1995-02-06

Nearby terms:

non-volatile storage ♦ noob ♦ no-op ♦ NOR ♦ NORC COMPILER ♦ NorCroft ♦ NORD PL

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