valid syllogism

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• Syllogism — A syllogism (Greek: συλλογισμός – syllogismos – conclusion, inference ) is a kind of logical argument in which one proposition (the conclusion) is inferred from two or more others (the premises) of a certain form. In antiquity, there were… …   Wikipedia

• syllogism — A syllogism (properly, a categorical syllogism) is the inference of one proposition from two premises. An example is: all horses have tails; all things with tails are four legged; so all horses are four legged. Each premise has one term in common …   Philosophy dictionary

• SYLLOGISM —    the TRADITIONAL term used in DEDUCTIVE LOGIC for an argument with a specific structure that includes two PROPOSITIONS and a conclusion. On the basis of its formal structure a syllogism may be judged logically VALID. If the propositions are… …   Concise dictionary of Religion

• Syllogism — Syl lo*gism, n. [OE. silogisme, OF. silogime, sillogisme, F. syllogisme, L. syllogismus, Gr. syllogismo s a reckoning all together, a reasoning, syllogism, fr. syllogi zesqai to reckon all together, to bring at once before the mind, to infer,… …   The Collaborative International Dictionary of English

• syllogism — /sil euh jiz euhm/, n. 1. Logic. an argument the conclusion of which is supported by two premises, of which one (major premise) contains the term (major term) that is the predicate of the conclusion, and the other (minor premise) contains the… …   Universalium

• Disjunctive syllogism — Rules of inference Propositional calculus Modus ponens (A→B, A ⊢ B) Modus tollens (A→B, ¬B ⊢ ¬A) …   Wikipedia

• Hypothetical syllogism — Rules of inference Propositional calculus Modus ponens (A→B, A ⊢ B) Modus tollens (A→B, ¬B ⊢ ¬A) …   Wikipedia

• Quasi-syllogism — is a term that is sometimes used to describe what might be otherwise called a categorical syllogism but where one of the premises is singular , and thus not a categorical statement. For example: #All men are mortal #Socrates is a man #Socrates is …   Wikipedia

• practical syllogism — Aristotle appears to have thought that practical reasoning could be represented in the shape of a syllogism, although the passages are fragmentary and not altogether consistent. In one version, the first premise would give a kind of action or… …   Philosophy dictionary

• rhetorical syllogism — noun : a truncated syllogism that is persuasive but not necessarily valid …   Useful english dictionary

• logic, history of — Introduction       the history of the discipline from its origins among the ancient Greeks to the present time. Origins of logic in the West Precursors of ancient logic       There was a medieval tradition according to which the Greek philosopher …   Universalium