Source example:
Original: No human is a stone.
Converse: No stone is a human.
These classes do not overlap. If nothing is both a human and a stone, swapping their names preserves the exclusion. A universal negative converts to another universal negative.
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Universal negative conversion
Simple Conversion of Propositions: Definition, Method and Rules
Source example:
Original: No human is a stone.
Converse: No stone is a human.
These classes do not overlap. If nothing is both a human and a stone, swapping their names preserves the exclusion. A universal negative converts to another universal negative.