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Definition The NOR operation is a logical operation on two logical values, typically the values of two propositions, that produces a value of true if and only if both operands are false. In other words, it produces a value of false if and only if at least one operand is true. The truth table of p NOR q (also written as p ⊥ q or p ↓ q) is as follows: One way of expressing p NOR q is , where the symbol signifies OR and the bar over the expression signifies the negation of the expression under the bar. Joint Denial NOR has the interesting feature that all other logical operators can be expressed by various functions of NOR. The logical NAND operator also has this ability to express all logical operations. The computer used in the spacecraft that first carried humans to the moon, the Apollo Guidance Computer, was constructed entirely using NOR gates with three inputs. Logical operators Related topics | ||||||||||
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