(n.) A reasoning which is false in point of form, that is, which is contrary to logical rules or formulae; a formal fallacy, or pseudo-syllogism, in which the conclusion does not follow from the premises.

Aristotelian sorites Goclenian sorites argument argument by analogy argumentum ad baculum argumentum ad captandum argumentum ad hominem bad case begging the question categorical syllogism circular argument claptrap crowd-pleasing argument dilemma empty words enthymeme fallacy figure formal fallacy hysteron proteron insincere argument logical fallacy material fallacy mere rhetoric mode modus tollens mood moonshine non sequitur petitio principii philosophism prosyllogism pseudosyllogism rule rule of deduction solecism sophism sophistry sorites syllogism verbal fallacy weak point