The book warns that mistakes can arise while combining and ordering concepts or judgments. Not every collection of statements is a sound definition or proof.
Bad inference: every cat is an animal; every dog is an animal; therefore every dog is a cat.
The conclusion does not follow. Sharing a broad class does not make dogs and cats the same kind.
We must check whether the premises actually entail the conclusion.
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How reasoning goes wrong
Nazar, Fikr and the Definition of Logic
The book warns that mistakes can arise while combining and ordering concepts or judgments. Not every collection of statements is a sound definition or proof.
Bad inference: every cat is an animal; every dog is an animal; therefore every dog is a cat.
The conclusion does not follow. Sharing a broad class does not make dogs and cats the same kind.
We must check whether the premises actually entail the conclusion.