Question

State contrary, contradictory, sub contrary, subaltern and superaltern of the following propositions.

i) All triangles are polygon.

ii) Some Indian citizens are not Indian voter. 

01 Mar 2026
Answer :
Word Count : 344
In traditional logic, the relationships between categorical propositions are explained with the help of the Square of Opposition. The four standard forms are: A (Universal Affirmative: All S are P), E (Universal Negative: No S are P), I (Particular Affirmative: Some S are P), and O (Particular Negative: Some S are not P). The relations of contrary, contradictory, subcontrary, subaltern, and superaltern are determined according to these forms. i) All triangles are polygon. This proposition is of type A, that is, Universal Affirmative (All S are P). The contrary of an A proposition is the E proposition having the same subject and predicate. Therefore, the contrary is: No triangles are
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