Fallacious Logic: Non Sequitur

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Presentation transcript:

Fallacious Logic: Non Sequitur Peter McKay & Lesley Goodaker

Origins and Function Latin origins Functions as a formal fallacy Latin origins which translate to “it does not follow” In a broad sense, a non sequitur is a logical fallacy, from the Latin word fallacia, meaning "trick.“ In rhetoric, NSs can be observed when a conclusion does not logically follow from the premises of an argument. systematic defect in deductive reasoning; “top down” approach; starts at the top with a very broad spectrum of information and they work their way down to a specific conclusion

Fallacy of the Undistributed Middle TYPE “FORM” EXAMPLE Fallacy of the Undistributed Middle All A is C. B is C. Therefore, B is A. All leaves on trees are green. U.S paper bills are green. Therefore, all U.S paper bills are leaves that grow on trees. Affirming the Consequent If A then B. B. Therefore, A. If it's raining then the streets are wet. The streets are wet. Therefore, it's raining. Denying the Antecedent If A then B. Not A. Therefore, not B. If I have an axe, I am a lumberjack. I don’t have an axe, therefore I am not a lumberjack. Affirming a Disjunct Either A or B. It’s A. Therefore, it is not B. Either it's raining or the sun is shining. It's raining. Therefore, the sun is not shining. Denying a Conjunct Not both A and B. Not B. Therefore, A. John is not both a liberal and pro-life. John is not pro-life. Therefore, John is a liberal.

Identifying a Non Sequitur: Politics “If ‘experts’ could always be trusted to make the right moral decision, then public participation would not be necessary—but they cannot be, and so it is.” ~Carl Sagan

Identifying a Non Sequitur: Pop Culture

There are 5 common types of non sequiturs.

Works Cited Curtis, Gary N. "Taxonomy of the Logical Fallacies." Taxonomy of the Logical Fallacies. The Fallacy Files, n.d. Web. 20 Sept. 2015. Johnston, John. "Logical Fallacies Part II." Logical Fallacies Part II: Slippery Slope, False Analogy, & Non-Sequitur. College of the Redwoods, n.d. Web. 20 Sept. 2015. "Non Sequitur - Examples and Definition of Non Sequitur." Literary Devices. Literarydevices.net, 02 Jan. 2014. Web. 20 Sept. 2015. Sardinha, Anthony. “JJBATAS Parody: Episode 9 (2/2)” Online video clip. YouTube. YouTube, 9 March 2010. Web. 18. Sept. 2015.