What is the Square of Opposition?
Which propositions are contradictories on the Square of Opposition?
Hint: Contradictories cannot both be true and cannot both be false
Which propositions are contraries?
Hint: Contraries cannot both be true but can both be false
Which propositions are subcontraries?
Hint: Subcontraries can both be true but cannot both be false
What is a subaltern relationship?
Hint: If the universal is true, the particular must be true (in traditional logic)
If 'All dogs are mammals' (A) is TRUE, what can we infer about 'Some dogs are mammals' (I)?
If 'All dogs are reptiles' (A) is FALSE, what do we know about 'No dogs are reptiles' (E)?
If 'Some dogs are brown' (I) is FALSE, what do we know about 'No dogs are brown' (E)?
What is the Square of Opposition?
What are contradictory propositions on the Square of Opposition?
What are contrary propositions on the Square of Opposition?
What are subcontrary propositions on the Square of Opposition?