Incorrect converse: Every animal is human.
Valid converse: Some animals are human.
The category animal is broader than human; horses and birds are animals too. The original proposition covers every human, not every animal. A common error is exchanging subject and predicate while automatically retaining every.
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Why “Every animal is human” fails
Simple Conversion of Propositions: Definition, Method and Rules
Incorrect converse: Every animal is human.
Valid converse: Some animals are human.
The category animal is broader than human; horses and birds are animals too. The original proposition covers every human, not every animal. A common error is exchanging subject and predicate while automatically retaining every.