İBN SÎNÂ VE NASÎRUDDÎN TÛSÎ MANTIĞINDA ŞARTLI ÖNERMELER
AVICENNA AND TÛSÎ ON THE LOGIC OF CONDITIONAL PROPOSITIONS

Summary/Abstract: This article examines the approaches of Avicenna and Nasîr al-Dîn al-Tûsî to the conditional propositions. The conditional propositions and inferences have an important place in the logical theories of Arabic philosophers. The fully articulated theory of the conditional propositions was developed for the first time by Avicenna (d. 1037) in Arabic logic, although we can find early discussion of this issue in al-Fârâbî’s (s. 950) works. Avicenna’s commentator Nasîr al-Dîn alTûsî (d. 1274) evaluated Avicenna’s doctrines on the conditional propositions and made considerable contributions to these doctrines. This article aims to survey Avicenna’s and al-Tûsî’s views on hypothetical and disjunctive propositions and their subtypes. It discusses, especially, implicational (luzûmiyya) and accidental (ittıfâkiyya) propositions as subtypes of hypothetical propositions as well as subtypes of disjunctive propositions

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