undistributed middle, fallacy of the
If an argument has the form of a syllogism, but the middle term is not distributed, it will not be valid: all people are mammals, some mammals are cats, therefore?

Philosophy dictionary. . 2011.

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  • Fallacy of the undistributed middle — The fallacy of the undistributed middle is a logical fallacy that is committed when the middle term in a categorical syllogism isn t distributed. It is thus a syllogistic fallacy. Pattern The fallacy of the undistributed middle takes the… …   Wikipedia

  • Fallacy of distribution — A fallacy of distribution is a logical fallacy occurring when an argument assumes there is no difference between a term in the distributive (referring to every member of a class) and collective (referring to the class itself as a whole)… …   Wikipedia

  • undistributed middle — noun : a syllogistic fallacy in which neither premise conveys information about all members of the class designated by the middle term the argument “All men are sinners, and all weaklings are sinners, therefore all men are weaklings” says nothing …   Useful english dictionary

  • undistributed middle — noun Logic a fallacy arising from the failure of the middle term of a syllogism to refer to all the members of a class in at least one premise …   English new terms dictionary

  • undistributed middle — /ˌʌndəsˌtrɪbjutəd ˈmɪdl/ (say .unduhs.tribyoohtuhd midl) noun Logic a syllogistic fallacy in which the second premise does not apply to all members of the class in the first premise, and therefore cannot provide the basis for a conclusion …   Australian English dictionary

  • Fallacy — In logic and rhetoric, a fallacy is usually incorrect argumentation in reasoning resulting in a misconception or presumption. By accident or design, fallacies may exploit emotional triggers in the listener or interlocutor (appeal to emotion), or… …   Wikipedia

  • undistributed — adj. not distributed. Phrases and idioms: undistributed middle Logic a fallacy resulting from the failure of the middle term of a syllogism to refer to all the members of a class …   Useful english dictionary

  • Deductive fallacy — A deductive fallacy is defined as a deductive argument that is invalid. The argument itself could have true premises, but still have a false conclusion.[1] Thus, a deductive fallacy is a fallacy where deduction goes wrong, and is no longer a… …   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

  • Distribution of terms — A categorical term is said to be distributed if all members of that category are included. In a statement such as all A are either B or C , the categorical term, A, is distributed, because all members of set A are included. The categorical terms …   Wikipedia

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