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Chapter 4: Informal Fallacies © Oxford University Press
In This Chapter A.Fallacies of Relevance B.Fallacies of Unwarranted Assumption C.Fallacies of Ambiguity or Diversion D.Recognizing Fallacies in Ordinary Language © Oxford University Press
Fallacies Fallacy: A defect in an argument that consists in something more than merely false premises. Both deductive and inductive arguments may contain fallacies, and, if they do, they are either unsound or uncogent, depending on the kind of argument. Also, if an argument is either unsound or uncogent, then it has one or more false premises or contains a fallacy or both. Two kinds of fallacies: formal fallacies and informal fallacies © Oxford University Press
Informal Fallacies Formal fallacy: A logical error in a deductive argument that occurs in the form or structure of an argument. All beagles are dogs. All B are D. All poodles are dogs.All P are D. All beagles are poodles. All B are P. Informal fallacy: A mistake in reasoning that occurs in ordinary language, including mistakes due to relevance, unwarranted assumption, and ambiguity or diversion. © Oxford University Press Any substitutions of this exact form will also be INVALID
Informal fallacies cannot be detected by form, but require an analysis of content, regardless of whether the argument is inductive or deductive. Consider: All factories are plants All plants have chlorophyll All factories have chlorophyll This appears to have the form: All A are B All B are C All A are C Which is clearly valid. © Oxford University Press
But, given that the word “plant” is used in two different ways, the form is actually: All A are B All C are D All A are D Notice, then, the argument contains an informal and a formal fallacy. © Oxford University Press
Fallacies of Relevance Fallacies that occur whenever irrelevant premises are offered in support of a conclusion. Irrelevant premises often rely on psychological or emotional appeal for their persuasive force. 1.Argument Against the Person 2. Tu Quoque 3.Appeal to the People 4.Appeal to Pity 5.Appeal to Force 6.Appeal to Ignorance 7.Missing the Point 8.Appeal to an Unqualified Authority © Oxford University Press
Argument Against the Person Argumentum ad Hominem — “to the person” When a claim is rejected based on alleged character flaws, negative stereotype, or life circumstances of the person making the claim. © Oxford University Press Senator Hilltop thinks my administration’s tax proposals are bad for the country. His political party lost the last election. Members of the losing party are always jealous of the winning party. The premises attack Senator Hilltop's party affiliation and negatively stereotype the senator and his party.
Tu Quoque Tu Quoque — “you, too” A type of ad hominem fallacy distinguished by the attempt of one person to avoid the issue at hand by claiming the other person is a hypocrite. © Oxford University Press You have been lecturing me about not joining a gang. But Dad, you were a gang member, and you never went to jail. So, I'll make my own decision about joining a gang. This tu quoque attack is aimed at the dad, not at dad's arguments. The premises are used to imply that “Dad, you are a hypocrite,” which is then used to reject Dad’s arguments: I can disregard your lectures.
Appeal to the People Argumentum ad Populum The avoidance of objective evidence in favor of an emotional response, defeating a rational investigation of truth. © Oxford University Press Public schoolteachers are demanding a pay raise and are threatening to strike. A prolonged strike will jeopardize our children’s future and result in an unbalanced budget, leading to raised taxes. So are you for or against a pay raise for public school teachers? Terms like demanding, threatening, prolonged strike, and jeopardize evoke a sense of dire consequences and provoke anger in taxpayers and voters..
Appeal to Pity Argumentum ad Misericordiam — “from pity or guilt” An emotional plea that relies solely on a sense of pity for support. © Oxford University Press Your honor, before you sentence my client for the murder of his parents, I ask you to consider his situation. He is an orphan. Perhaps you can give him the lightest punishment possible. The premises simply ask the judge to pity the defendant because he is a self-caused orphan.
Appeal to Force Argumentum ad Baculum — “appeal to the stick” A threat of harmful consequences (physical and otherwise) used to force acceptance of a course of action that would otherwise be unacceptable. © Oxford University Press If the workers of this company do not agree to a 25% cut in salary, then the company may have to shut its doors. Therefore, the workers of this company must agree to a 25% cut in salary. The premise is an obvious threat without providing objective evidence for the conclusion..
Appeal to Ignorance Argumentum ad Ignorantiam — “arguing from ignorance” An argument built on a position of ignorance claiming either: 1.a statement must be true because it has not been proven to be false or 2.a statement must be false because it has not been proven to be true. © Oxford University Press There is no life anywhere else in the universe. We have never received signals from any part of space. The conclusion is based on the lack of signals from outer space, while our failure to detect signals may signify our ignorance of better methods for detecting life.
Missing the Point Ignoratio Elenchi — “irrelevant proof” When premises that seem to lead logically to one conclusion are used instead to support an unexpected conclusion. © Oxford University Press If we buy a second car, the insurance will only be an additional $400 a year. Let’s go get one before the insurance company changes the rate. The gap between the premises and conclusion is so great that the conclusion becomes, in a sense, irrelevant.
Appeal to Unqualified Authority Argumentum ad Verecundiam — “appeal to reverence or respect” Relies on the opinions of people who have no expertise, training, or knowledge relevant to the issue at hand. © Oxford University Press I'm Nick Panning, quarterback of the Los Angeles Seals. I've been eating Oaties for breakfast since I was a kid. Oaties provides nutrition and vitamins and helps build strong bones. Oaties tastes great. You should get some for your kids today. Merely being famous does not qualify someone to pronounce the merits of a product.
Chapter 6 Lecture Notes Working on Relevance. Chapter 6 Understanding Relevance: The second condition for cogency for an argument is the (R) condition.
Common Logical Fallacies Flawed Arguments. Logical Fallacies… Flaws in an argument Often subtle Learning to recognize these will: – Strengthen your own.
Informal Fallacies Let’s see some more examples!.
Ad Hominem (Personal Attack) An attempt to discredit the argument by discrediting the character of the person advancing it.
Fallacy Argument that may seem to be correct, but that proves on examination not be so. A fallacy is an error in reasoning.
INFORMAL FALLACIES The aim of this tutorial is to help you learn to recognize and resist fallacious arguments.
Logic Fallacies Debate Class Production Spain Park High School Hoover, Alabama
Argumentum Ad Hominem Attacking the person’s character or personal traits rather than the argument at hand Rejecting a claim based on the person defending.
Philosophy 103 Linguistics 103 More Introductory Logic: Critical Thinking Dr. Robert Barnard.
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Lecture Notes © 2008 McGraw Hill Higher Education© 2008 McGraw Hill Higher Education 1 Critical Thinking Chapter 5 Logical Fallacies I Fallacies of Relevance.
C OMMON L OGICAL F ALLACIES English O VERGENERALIZATION : Statements that are so general that they oversimplify reality.
Flawed Arguments COMMON LOGICAL FALLACIES. Flaws in an argument Often subtle Learning to recognize these will: Strengthen your own arguments
Fallacies The quickest ways to lose arguments. Introduction to Logic O Argument: The assertion of a conclusion based on logical premises O Premise: Proposition.
COMMON LOGICAL FALLACIES FLAWED ARGUMENTS. LOGICAL FALLACIES… Flaws in an argument Often subtle Learning to recognize these will: –Strengthen your own.
Unit Four Seminar. Fallacies A.What is a fallacy? 1. A fallacy is a defect in an argument that consists in something other than false premises alone.
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Reason: as a Way of Knowing Richard van de Lagemaat, Theory of Knowledge for the IB Diploma (Cambridge: CUP, 2005)
INFORMAL FALLACIES. FALLACIES OF RELEVANCE Errors resulting from attempts to appeal to things that are not relevant, i.e., not really connected to or.
Logical Fallacies A logical fallacy is an element of an argument that is flawed If spotted one can essentially render an entire line of reasoning invalid.
Propaganda/Persuasion Techniques How the media influences us.
Philosophy 148 Chapter 5. Fallacies: Two categories of fallacies: Category 1Fallacies that have irrelevant premises. Category 2Fallacies that have unacceptable.
FLAWED ARGUMENTS Common Logical Fallacies. Logical Fallacies… Flaws in an argument Often subtle Learning to recognize these will: Strengthen your own.
Age of the Sage Advertising, Inc. “I cannot teach anybody anything; I can only make him think.” Socrates.
Reminder: there are many ways in which reasoning can go wrong; that is, there are many kinds of mistakes in argument. It is customary to reserve the term.
Rhetorical Fallacies. What is Rhetorical Fallacy? Rhetorical fallacy Rhetorical fallacy Is a failure of discussion or argument Is a failure of discussion.
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Common Logical Fallacies Flawed Arguments. Logical Fallacies… Copy the following information on fallacies. Fallacies are: Flaws in an argument Often subtle.
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Chapter Two: Good Reasoning Review Applying Ethics: A Text with Readings (10 th ed.) Julie C. Van Camp, Jeffrey Olen, Vincent Barry Cengage Learning/Wadsworth.
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Logical Fallacies. Definition & Facts Defects that weaken arguments weaken arguments Common in politics and politics and advertisements advertisements.
Persuasive and Argument. Aren’t they the same thing? Persuasive v. Argument Similarities 1.Author makes a claim 2.Purpose is to convince an audience to.
Fallacies for Persuasive Writing Part I Ad Hominem Appeal to Emotion Appeal to Authority Bandwagon Straw Man Slippery Slope.
Critical Thinking: Chapter 10 Inductive Arguments.
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Logic and Logical Fallacies A.P. English Language.
English 9H. A failure in reasoning that makes an argument invalid Faulty reasoning; misleading or unsound argument.
Persuasive To convince someone to believe in something or do something. Writers may use language that appeals to the reader’s senses.
Logical Fallacies Persuasion Pitfalls. Logical Fallacies What is a logical fallacy? A mistake in reasoning that seriously affects the ability to argue.
The aim of this tutorial is to help you learn to identify the types of fallacious reasoning discussed in Chapter 6. Chapter 6 discusses fallacies of insufficient.
Fallacies of Irrelevance Naomi Sanderovsky, Ph.D..
Mike McGuire MV Community College COM 101 A Closer Look at Logos Syllogism, Enthymeme, and Logical Fallacies ENGL102 Ordover Fall 2008.
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