A logical fallacy
in which both term
s of a categorical syllogism
, but the conclusion
. This is a problem because some universal categories
are not instantiated
All big hairy monsters in my room are under the bed.
All beds in my room are in the corner.
Therefore, some big hairy monsters are in the corner of my room.
To prove the fallacy, assume the premises are true but that there are no instances of the category. For example, i checked the corner of my room. No monsters found. Note that it's still an invalid argument even if the conclusion is true!