Categorical Prepositions Converse, Inverse, Obverse, Contrapositive YouTube Lecture Handouts

Doorsteptutor material for IAS is prepared by world's top subject experts: Get detailed illustrated notes covering entire syllabus: point-by-point for high retention.

Categorical Prepositions Converse, Inverse, Obverse, Contrapositive

• Obverse will always be valid form
• Converse is not valid in A & O
• Contrapositive is not valid in E & I

Cases –

• All S is P
• Converse – All P is S
• Obverse – No S is non P
• Contrapositive All non P is non S

• Obverse will always be valid form
• Converse is not valid in A & O
• Contrapositive is not valid in E & I

Cases –

• All S is P
• Converse – All P is S
• Obverse – No S is non-P
• Contrapositive all non P is non S
• Valid if P exists
• Converse of A - Some P is S
• Converse of E – Some P is not S

-Manishika