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Definition:
Since the Middle Ages, categorical propositions have been given the following letters as labels:
A, E, I, and O. The reason why this happened is uncertain.
These are the first four vowels of the Roman alphabet, but A and I, which are
applied to affirmative propositions, are also the first two vowels in the Latin for "I affirm" (affirmo),
and the letters E and O, which are applied to the negative propositions, are the two vowels in
the Latin for "I deny" (nego).
| Letter | Proposition | Quantity | Quality |
| A | All S are P. | universal | affirmative |
| E | No S are P. | universal | negative |
| I | Some S are P. | particular | affirmative |
| O | Some S are not P. | particular | negative |
Also Known As: none
Alternate Spellings: none
Common Misspellings: none
Related Resources:
What is the Logic and the Philosophy of Language?
The two fields Logic and the Philosophy of Language are often treated separately, but they are nevertheless close enough that they are presented together here. Logic is the study of methods of reasoning and argumentation, both proper and improper. The Philosophy of Language, on the other hand, involves the study of how our language interacts with our thinking.What is Philosophy?
What is philosophy? Is there any point in studying philosophy, or is it a useless subject? What are the different branches of philosophy - what's the difference between aestheitcs and ethics? What's the difference between metaphysics and epistemology?
