Suppose some teachers are also authors:
“Some teachers are authors.”
“Some authors are teachers.”
The first has teachers as subject and authors as predicate. The second exchanges them. The very same person who makes the original true makes its converse true.
No new shared member is required. Particular affirmative conversion relies on the overlap already established by the original claim.
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Simple Conversion: Definition, Categorical Rules and Reductio
Suppose some teachers are also authors:
“Some teachers are authors.”
“Some authors are teachers.”
The first has teachers as subject and authors as predicate. The second exchanges them. The very same person who makes the original true makes its converse true.
No new shared member is required. Particular affirmative conversion relies on the overlap already established by the original claim.