«والموجبة الجزئية لا تنعكس بهذا العكس»
A particular affirmative does not validly contrapose by this method.
Consider “Some animals are nonhumans,” true of horses. The mechanical result “Some humans are nonanimals” is false.
A true particular affirmative can therefore produce a false result. There is no general A-like contraposition rule for I-propositions.
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Contraposition: Classical Rules, Validity and the Later Convention
«والموجبة الجزئية لا تنعكس بهذا العكس»
A particular affirmative does not validly contrapose by this method.
Consider “Some animals are nonhumans,” true of horses. The mechanical result “Some humans are nonanimals” is false.
A true particular affirmative can therefore produce a false result. There is no general A-like contraposition rule for I-propositions.