invalid syllogism

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• syllogism — ► NOUN ▪ a form of reasoning in which a conclusion is drawn from two given or assumed propositions (premises); a common or middle term is present in the two premises but not in the conclusion, which may be invalid (e.g. all dogs are animals; all… …   English terms dictionary

• 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 — [ sɪləˌdʒɪz(ə)m] noun a form of reasoning in which a conclusion is drawn from two given or assumed propositions (premises); a common or middle term is present in the two premises but not in the conclusion, which may be invalid (e.g. all dogs are… …   English new terms dictionary

• syllogism — n. 1 a form of reasoning in which a conclusion is drawn from two given or assumed propositions (premisses): a common or middle term is present in the two premisses but not in the conclusion, which may be invalid (e.g. all trains are long; some… …   Useful english dictionary

• syllogistic — syllogism ► NOUN ▪ a form of reasoning in which a conclusion is drawn from two given or assumed propositions (premises); a common or middle term is present in the two premises but not in the conclusion, which may be invalid (e.g. all dogs are… …   English terms dictionary

• Negative conclusion from affirmative premises — is a syllogistic fallacy committed when a categorical syllogism has a negative conclusion yet both premises are affirmative. The inability of affirmative premises to reach a negative conclusion is usually cited as one of the basic rules of… …   Wikipedia

• List of fallacies — For specific popular misconceptions, see List of common misconceptions. A fallacy is incorrect argumentation in logic and rhetoric resulting in a lack of validity, or more generally, a lack of soundness. Contents 1 Formal fallacies 1.1… …   Wikipedia

• Aristotle’s logic and metaphysics — Alan Code PART 1: LOGICAL WORKS OVERVIEW OF ARISTOTLE’S LOGIC The Aristotelian logical works are referred to collectively using the Greek term ‘Organon’. This is a reflection of the idea that logic is a tool or instrument of, though not… …   History of philosophy

• Argument — This article is about the subject as it is studied in logic and philosophy. For other uses, see Argument (disambiguation). In philosophy and logic, an argument is an attempt to persuade someone of something, by giving reasons or evidence for… …   Wikipedia

• 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

• Nyaya — Part of a series on Hindu philosophy …   Wikipedia