What are the basic types of natural propositions?

According to different standards, outspoken propositions can be divided into different categories.

1. According to the number of propositions, outspoken propositions can be divided into singular propositions, full-name propositions and special propositions.

2. According to the nature of the proposition, the outspoken proposition can be divided into positive proposition and negative proposition.

3. According to the quality and quantity of propositions, outspoken propositions can be divided into simple affirmative propositions, simple negative propositions, full-name affirmative propositions (SAP), full-name negative propositions (SEP), special affirmative propositions (SIP) and special negative propositions (SOP).

Proposition form:

1. For two propositions, if the conditions and conclusions of one proposition are the conclusions and conditions of the other, then these two propositions are called reciprocal propositions, one of which is called the original proposition and the other is called the inverse proposition of the original proposition.

2. For two propositions, if the conditions and conclusions of one proposition are the negation of the conditions and conclusions of the other, then these two propositions are called mutually negative propositions, one of which is called the original proposition and the other is called the negative proposition of the original proposition.

3. For two propositions, if the condition and conclusion of one proposition are the negation of the conclusion and condition of the other proposition, then these two propositions are called mutually negative propositions, one of which is called the original proposition and the other is called the negative proposition of the original proposition.

Extended data:

Many traditional logic readers often classify singular propositions as universal propositions when discussing reasoning, because both singular propositions and universal propositions determine the extension of a subject, so six propositions become four types.

1, the full name affirmative proposition reflects that all extensions of the main term have certain properties, and the expression form is: all s are P, abbreviated as SAP, abbreviated as proposition A.

2. The full-name negative proposition reflects the uncertain nature of all the extensions of the subject, which is manifested as: all S are not P, abbreviated as SEP, and abbreviated as E proposition.

3. The special affirmative proposition reflects that some extensions of the subject have certain properties, which are as follows: some S are P, abbreviated as SIP, and abbreviated as I proposition.

4. The special negative proposition reflects that the partial extension of the subject item does not have some properties, which are as follows: some S are not P, abbreviated as SOP, and abbreviated as O proposition.

Baidu Encyclopedia-Natural Proposition

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