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fa اعتبارسنجی برهان ناصرخسرو در رد صانع‌بودن افلاک Validation of Naser Khusraw's Argument Rejecting the Celestial Spheres as Creator In the Sixth Discourse of the Zad al-Musafirin, Nasir Khusraw presents his most extensive argument refuting the claim of the materialists that the celestial spheres are the creators of the universe. This argument’s foundation comprises concepts related to the motion of elemental natures and generated beings, as well as the subjugated or dominant nature of celestial spheres and their rotational motion. The findings ultimately reveal that, while Nasir Khusraw’s argument is methodologically sound and formally valid, its premises contain unsubstantiated assumptions and exhibit false analogies. Additionally, the argument includes auxiliary lemmas, some of which hold scholarly value, while others are redundant and could be excised from its core framework. Zad al-Musafirin, Naser Khusraw, Argument, Celestial Spheres (aflāk), Compulsory Motion 463 488 http://jpt.daneshafarand.org/browse.php?a_code=A-10-2-9388&slc_lang=fa&sid=6 K. Mehrabadi کتایون مهرآبادی 1003194753284600380578 1003194753284600380578 Yes Department of Persian Language and Literature, Faculty of Persian Literature and Foreign Languages, Allameh Tabatabaie University, Tehran, Iran گروه زبان و ادبیات فارسی، دانشکده ادبیات فارسی و زبان‌های خارجی، دانشگاه علامه طباطبایی، تهران، ایران M.H. Hasanzadeh Niri محمدحسن حسن‌زاده نیری 1003194753284600380579 1003194753284600380579 No Department of Persian Language and Literature, Faculty of Persian Literature and Foreign Languages, Allameh Tabatabaie University, Tehran, Iran گروه زبان و ادبیات فارسی، دانشکده ادبیات فارسی و زبان‌های خارجی، دانشگاه علامه طباطبایی، تهران، ایران