The Fallacy of the undistributed middle reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Fallacy of the undistributed middle

The fallacy of the undistributed middle is a logical fallacy that is committed when the middle term in a catagorical syllogism isn't distributed.

For example:

All dogs are animals.

All cats are animals.

''Therefore, all cats are dogs.

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