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quality and quantity
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 Related Terms
• categorical proposition


In a categorical proposition, two important attributes which determine how it is to be evaluated are quality and quantity. The quality of a proposition is based on whether it is affirmative or negative. The following two standard-form propositions have an affirmative quality:

All S are P.
Some S are P.

The following two propositions have a negative quality:

No S are P.
Some S are not P.

Quantity is determined by whether or not a proposition is universal or particular - that is to say, whether or not the proposition makes a statement about every member of the class denoted in the subject term or just some members of the class denoted in the subject term. The following two propositions have a universal quantity:

All S are P.
No S are P.

The following two propositions have a particular quantity:

Some S are P.
Some S are not P.

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?

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