Argument from fallacy
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:There is an argument '''A''' which has a conclusion '''C'''. | :There is an argument '''A''' which has a conclusion '''C'''. | ||
:That argument '''A''' contains a logical fallacy. | :That argument '''A''' contains a logical fallacy. | ||
| − | :Therefore, '''C''' is false. | + | :[[Non sequitur|Therefore]], '''C''' is false. |
The issue here is that while the presence of a fallacy is sufficient to render argument '''A''' invalid, it does not make '''C''' false. Rather, the truth value of '''C''' is unknown, because there is no valid argument as to whether '''C''' is true or false. | The issue here is that while the presence of a fallacy is sufficient to render argument '''A''' invalid, it does not make '''C''' false. Rather, the truth value of '''C''' is unknown, because there is no valid argument as to whether '''C''' is true or false. | ||
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* Bob says it's true because [[Charles Darwin]] said so - which is an [[argument from authority]], and thus a fallacy. | * Bob says it's true because [[Charles Darwin]] said so - which is an [[argument from authority]], and thus a fallacy. | ||
* Therefore, evolution is false. | * Therefore, evolution is false. | ||
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| + | {{DEFAULTSORT:Fallacy, Argument from}} | ||
| + | [[Category:Logical fallacies]] | ||
Latest revision as of 12:59, 12 March 2012
An argument from fallacy is a formal fallacy which occurs when analyzing an argument and assuming that, because the argument contains a logical fallacy the conclusion of that argument must be false. It is also commonly referred to as the fallacist's fallacy.
Form
The form of the argument from fallacy requires a meta-argument, or an argument about the claims of an argument.
- There is an argument A which has a conclusion C.
- That argument A contains a logical fallacy.
- Therefore, C is false.
The issue here is that while the presence of a fallacy is sufficient to render argument A invalid, it does not make C false. Rather, the truth value of C is unknown, because there is no valid argument as to whether C is true or false.
Example
- Bob asserts that evolution is true.
- Bob says it's true because Charles Darwin said so - which is an argument from authority, and thus a fallacy.
- Therefore, evolution is false.
