Illicit conversion
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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.
[edit] Structure
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.
[edit] Examples
All dolphins are mammals.
Therefore, all mammals are dolphins.
Some pupils are not undergraduates.
Therefore, some undergraduates are not pupils.
All squares are rectangles.
Therefore, all rectangles are squares.
All drinks are liquid.
Therefore, all liquids are drinks.
The Tooth Fairy, Flying Spaghetti Monster, and the Invisible Pink Unicorn, and other obvious mythical creators dont exist; perhaps even the Christian God doesnt exist.
Therefore, no deity or God exists.
[edit] Source
Fallacy Files -Illicit Conversion
