Elucidate square of opposition.
When two categorical propositions are of different forms but share exactly the same subject and predicate terms, their truth is logically interdependent in a variety of interesting ways, all of which are conveniently represented in the traditional "square of opposition."
"All S are P." (A)- - - - - - -(E) "No S are P."
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"Some S are P." (I)--- --- ---(O) "Some S are not P."
Propositions that appear diagonally across from each other in this diagram (A and O on the one hand and E and I on the other) are contradictories. No
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