A standard form categorical syllogism has two negative
premises (a negative premise is any premise of the form
'No S are P' or 'Some S is not P').
- No Manitobans are Americans, and no
Americans are Canadians, therefore,
no Manitobans are Canadians.
In fact, since Manitoba is a province
of Canada, all Manitobans are Canadians.
Assume that the premises are true. Find an example
which allows the premises to be true but which
clearly contradicts the conclusion.
26 May 1995