List of Articles ماهيت Open Access Article Abstract Page Full-Text 1 - Historical Development and Pre-Suppositions of the Theory of the Principiality of Existence in Tusi’s Analysis Hashem Ghorbani Open Access Article Abstract Page Full-Text 2 - Suhrawardi’s Background in Advocating Mentally-Positedness of Existence Mahmoud Hedayatafza Zeynab Bostani Open Access Article Abstract Page Full-Text 3 - Historical Development of the Concept of Hyle (Matter) in the Works of Muslim Thinkers Mahmoud Hedayatafza Mohammad Javad Rezaeirah Open Access Article Abstract Page Full-Text 4 - Principiality of Existence and Change in the Logic of Definition Musa Malayeri Open Access Article Abstract Page Full-Text 5 - Existence, Annexation, and Derivation: A Study of Mir Damad’s Theory on Being Existent and Derivation Davood Hosseini Open Access Article Abstract Page Full-Text 6 - Range of the Interpretations of Quiddative Concepts Based on the Principiality of Existence in the View of Contemporary Commentators of Sadrian Wisdom Rohollah Adineh Roghayeh Mosavi Open Access Article Abstract Page Full-Text 7 - A Review of Mullā Ṣadrā’s Responses to the Problem of the Necessity of Subsuming One Quiddity into two Categories in the Discussion of Mental Existence Mohammad Hadi Tavakkoli