logic

The study of the principles of reasoning, especially of the structure of propositions as distinguished from their content and of method and validity in deductive reasoning.

A system of reasoning.

A mode of reasoning.

The formal, guiding principles of a discipline, school, or science.

Valid reasoning.

The relationship between elements and between an element and the whole in a set of objects, individuals, principles, or events.

The nonarithmetic operations performed by a computer, such as sorting, comparing, and matching, that involve yes-no decisions.

Computer circuitry.