modus tollens

noun 0.781

modus

noun 0.626

affirming the consequent

noun 0.621

disjunctive syllogism

noun 0.535

deductive reasoning

noun 0.532

strict implication

noun 0.531

classical logic

noun 0.526

syllogism

noun 0.517

petitio principii

noun 0.514

modal logic

noun 0.511

informal logic

noun 0.505

law of excluded middle

noun 0.501