Original: No triangle is a circle.
Subject: triangle.
Predicate: circle.
Converse: No circle is a triangle.
The exclusion works in either direction. We exchange the terms while preserving both negation and universal quantity.
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Another universal negative example
Simple Conversion of Propositions: Definition, Method and Rules
Original: No triangle is a circle.
Subject: triangle.
Predicate: circle.
Converse: No circle is a triangle.
The exclusion works in either direction. We exchange the terms while preserving both negation and universal quantity.