An illicit conversion is the invalid inversion of a A- or O-type proposition. It can also be defined as an argument which entails the arbitrary assignment of a specific trait of a set to one of its subsets.
The basic forms of the illicit conversion are as follows:
All A are B.
Therefore, all B are A.
Not all A are B.
Therefore, not all B are A.
All dolphins are mammals.
Therefore, all mammals are dolphins.
Some pupils are not undergraduates.
T...
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Illicit Conversion
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