Quantity is signaled by words such as every, no, and some. Simple conversion does not require preserving quantity in every case:
Every S is P → Some P are S.
No S is P → No P is S.
Some S are P → Some P are S.
Some S are not P → no general simple converse.
Always verify the logical consequence and the preserved affirmative/negative quality.
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Quantity may change while quality stays
Simple Conversion of Propositions: Definition, Method and Rules
Quantity is signaled by words such as every, no, and some. Simple conversion does not require preserving quantity in every case:
Every S is P → Some P are S.
No S is P → No P is S.
Some S are P → Some P are S.
Some S are not P → no general simple converse.
Always verify the logical consequence and the preserved affirmative/negative quality.