VENN ŞEMALARIYLA KATEGORİK KIYASLARIN VAROLUŞSAL KİPLERİNİN GEÇERLİLİĞİNİN DENETLENMESİNDE KURAL ÖNERİLERİ
RULES PROPOSAL THAT DETERMINING VALIDITY OF EXISTENTIAL MOODS OF CATEGORICAL SYLLOGISMS BY VENN DIAGRAMS

Summary/Abstract: Some difficulties on formal logic arise in the validity control of syllogisms by Venn diagrams. While it is quite easy to understand and determine strong valid syllogisms by Venn diagrams, the difference between the weak valid conditions and invalid conditions cannot be easily understood. Although the formation of a categorical syllogism as weak valid is accepted to be true by Aristotle, it is called existential fallacy by Boole because such syllogisms which we can call “subalternate mood” reach a particular conclusion from two universals and, thus, reach a particular proposition with an existential import from universal propositions with no existential import and make an existential supposition. This of course will be the focus of another study because this study accepts from the beginning that existentially supposed syllogisms are valid and the presence of rules related to the validity while controlling with Venn diagrams is researched. In this study which can be considered to be very technical, it is aimed to guide academicians and educators as well. The basic problem is to find comprehensive rules related to the validity of syllogisms in weak or existential mood.

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