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.

Look at other dictionaries:

  • 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

  • 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

  • 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 — 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

  • Affirming the consequent — Affirming the consequent, sometimes called converse error, is a formal fallacy, committed by reasoning in the form: If P, then Q. Q. Therefore, P. An argument of this form is invalid, i.e., the conclusion can be false even when statements 1 and 2 …   Wikipedia

  • Naturalistic fallacy — The naturalistic fallacy is often claimed to be a formal fallacy. It was described and named by British philosopher G. E. Moore in his 1903 book Principia Ethica. Moore stated that a naturalistic fallacy is committed whenever a philosopher… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”

We are using cookies for the best presentation of our site. Continuing to use this site, you agree with this.