QUANTITY AND QUALITY OF PROPOSITIONS
It states how much the proposition is affirmed or denied. It tries to show whether the proposition refers to all or some members of the class. Referring to quantity, there are three types of propositions.
- Universal propositions
This is a proposition that refers to whole of a class. E.g. all girls are intelligent, no men are dull
- Particular propositions
This is a proposition that refers to part of a class e.g. some youths are footballers, some Africans are not Cameroonians
- Singular propositions
This is a proposition that refer to an individual or thing only e.g. Yaoundé is the capital of Cameroon, change is a stubborn boy.
The quality of a proposition determines whether it is positive or negative. Referring to quality, there are two types of propositions.
This is a proposition that affirms class inclusion, either totally or partially e.g. some machines are computers, all footballers are players
This is a proposition that deny class inclusion, either totally or partially. E.g. no Muslims are Christians, no students are lazy.