Title: Üç Türk-Islam mütefekkiri İbn Sina, Fahreddin Râzî, Nasireddin Tûsî düşüncesinde varoluş
Subjects: Contributions in metaphysics, Islamic philosophy, Metaphysics
People: Avicenna (980-1037), Fakhr al-Dīn Muḥammad ibn ʻUmar Rāzī (1149 or 1150-1210), Naṣīr al-Dīn Muḥammad ibn Muḥammad Ṭūsī (1201-1274)