If and (i.e., , where denotes NOT, denotes implies, and denotes AND), then and are said to be inequivalent, a relationship which is written symbolically as , , or . Nonequivalence is implemented in the Wolfram Language as Unequal[A, B, ...]. Binary nonequivalence has the same truth table as XOR (i.e., exclusive disjunction), reproduced below.
T | T | F |
T | F | T |
F | T | T |
F | F | F |