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Chapter 4: Informal Fallacies
Intro to Logic
18
Philosophy
Undergraduate 1
02/12/2010

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Term
Formal Fallacy
Definition
Explicit use of invaild form
Term
Informal fallacies
Definition
Errors in reasoning that do not involve the explicit use of an invalid form.
Term
3 Types of Fallacies
Definition
- Fallacies of Irrelevance
- Fallacies involving ambiguity
- Fallacies involving unwarranted suspicions
Term
Argument Against the Person (Ad Hominem Fallacy) 3 types
Definition
Involves attacking the person who advances an argument as opposed to providing a rational critique of the argument (or statement) itself

- Abusive Ad Hominem (well, you're stupid!)
- Circumstantial Ad Hominem (well, you say this because you're a woman and this would make women more powerful)
- Tu quoque (you're a hypocrite
Term
Straw Man Fallacy
Definition
When a person attacks a misrepresentation of the opponent's view.
Term
Appeal to Force (Ad Baculum Fallacy)
Definition
Conclusion is defended by a threat to the well-being of those who do not accept it.
Term
Appeal to the People (Ad Populum Fallacy)
Definition
Attempt to persuade a person (or group) by appealing to the desire to be accepted or valued by others
Term
Appeal to Pity (Ad Misericordiam Fallacy)
Definition
Attempt to support a conclusion merely by invoking pity in one's audience
Term
Equivocation
Definition
2+ meanings of a word are used in a context in which validity requires a single meaning.
Term
Amphiboly
Definition
Double meaning in a sentence due to sentence structure as opposed to an ambiguous word or phrase. =
Term
Fallacy of composition
Definition
Invalid inference from the nature of the parts to the nature of the whole

Invalid inference from attributes of members of a group to attributes of the group itself.
Term
Amphiboly
Definition
Double meaning in a sentence due to sentence structure as opposed to an ambiguous word or phrase. =
Term
Composition
Definition
Parts attribute for whole
Term
Begging the question
Definition
Circular argument
Term
False dilemma
Definition
one that occurs when the premise unjustifiably reduces the number of alternatives to be considered.
Term
Appeal to unreliable authority (Ad verecundiam fallacy)
Definition
Obvious.
Term
False Cause Fallacy
Definition
obvious
Term
Complex question
Definition
Asking a question that illegitimately presupposes some conclusion alluded to in the question.

"Have you stopped beating your wife?"
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