Valid immediate inferences:
Converse
- Given a type E statement, from the traditional square of opposition, “No S are P.”, one can make the immediate inference that “No P are S” which is the converse of the given statement.
- Given a type I statement, “Some S are P.”, one can make the immediate inference that “Some P are S” which is the converse of the given statement.
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| Basics and Rules of Syllogism | |
| Immediate and Mediate Inferences | |
| Steps of Solve Syllogism with MCQs |
Obverse
- Given a type A statement, “All S are P.“, one can make the immediate inference that “No S are non-P” which is the obverse of the given statement.
- Given a type E statement, “No S are P.”, one can make the immediate inference that “All S are non-P” which is the obverse of the given statement.
- Given a type I statement, “Some S are P.”, one can make the immediate inference that “Some S are not non-P” which is the obverse of the given statement.
- Given a type O statement, “Some S are not P.”, one can make the immediate inference that “Some S are non-P” which is the obverse of the given statement.
Contra positive
- Given a type A statement, “All S are P.”, one can make the immediate inference that “All non-P are non-S” which is the contra positive of the given statement.
- Given a type O statement, “Some S are not P.”, one can make the immediate inference that “Some non–P are not non-S” which is the contrapositive of the given statement.