The structure of outspoken proposition

The structure of outspoken proposition is mainly composed of subject, predicate, quantity and conjunctions.

1. Subject: The concept of the judgment object, which is usually expressed in uppercase English letters, such as "s".

2. Predicate: a concept or a word that expresses nature, usually expressed in capital English letters, such as "p".

3. Quantity term: the concept of expressing the scope of the quantity of the subject term in an outspoken proposition, usually expressed by "all", "some" and "some".

4. Conjunction: indicates the judgment made, that is, affirmation or negation. Commonly used conjunctions are "yes" and "no".

The outspoken proposition is a propositional form in logic, which expresses the direct relationship between subject and predicate. In the outspoken proposition, subject and predicate are two different concepts, and there is no other intermediary concept between them. The form of an outspoken proposition is usually "the subject is (not) a predicate", in which the subject and the predicate are connected by a conjunction.

Types of outspoken claims:

1, full name affirmative proposition (SAP): This proposition means that all subjects are predicates, that is, all s are p, for example, "all cats are mammals" is a full name affirmative proposition.

2. Full name negative proposition (SEP): This proposition means that all subjects are not predicates, that is, all S are not P, for example, "all plants are not animals" is a full name negative proposition.

3. Special affirmative proposition (SIP): This proposition means that some subjects are predicates, that is, some s are p, for example, "Some cats like to eat fish" is a special affirmative proposition.

4. Special Negative Proposition (SOP): This proposition means that some subjects are not predicates, that is, some S are not P, for example, "Some flowers don't like sunshine" is a special negative proposition.

5. Singular proposition is a special form of outspoken proposition, including two forms: one is that the subject is a proper name, such as "Socrates is a man"; The other is that the subject is a limited general concept, such as "the man I said yesterday is a writer." Singular propositions have positive and negative points. Traditional logic thinks that its form is that this s is p; This s is not a p.