Deductive Fallacies: Difference between revisions
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There are some forms or argument that look like [[deductions]], but which are not. Here are the three most common invalid argument forms (or “deductive fallacies”): | There are some forms or argument that look like [[deductions]], but which are not. Here are the three most common invalid argument forms (or “deductive fallacies”): | ||
= | =Undistributed Middle= | ||
In Aristotelian syllogisms, the middle term (the one that is present in both premises) must be ''distributed'' that is, is must be said to apply to ''all'' or to ''none'' of one of the other terms. The fallacy of undistributed middle is committed when one has an argument that looks like an Aristotelian syllogism, except that the middle term is not distributed. Here's are some examples: | In Aristotelian syllogisms, the middle term (the one that is present in both premises) must be ''distributed'' that is, is must be said to apply to ''all'' or to ''none'' of one of the other terms. The fallacy of undistributed middle is committed when one has an argument that looks like an Aristotelian syllogism, except that the middle term is not distributed. Here's are some examples: | ||
Revision as of 14:12, 2 September 2024
There are some forms or argument that look like deductions, but which are not. Here are the three most common invalid argument forms (or “deductive fallacies”):
Undistributed Middle
In Aristotelian syllogisms, the middle term (the one that is present in both premises) must be distributed that is, is must be said to apply to all or to none of one of the other terms. The fallacy of undistributed middle is committed when one has an argument that looks like an Aristotelian syllogism, except that the middle term is not distributed. Here's are some examples:
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