a complex of methods or rules governing behavior

the syllogistic logic of Aristotle as developed by Boethius in the Middle Ages

any logical system that abstracts the form of statements away from their content in order to establish abstract criteria of consistency and validity

gain knowledge of (an area not known or experienced) by extrapolating

reason or establish by induction

reason by deduction; establish by deduction

prove negative; show to be false

derive by reason