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logical operation

  1. A logical or Boolean operation on N-state variables is one that yields a single N-state variable; e.g., a comparison on the 3-state variables A and B, each represented by -, 0, or +, which yields: - when A is less than B, 0 when A equals B, and + when A is greater than B. Specifically, operations such as AND, OR, and NOT on two state variables which occur in the algebra of logic; i.e. Boolean algebra.

  2. Logical operations are the operations of logical shifting, masking, and other non-arithmetical operations of a computer.

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Source: Van Nostrand's Scientific Encyclopedia, Fifth Edition