The extended and revised 3rd edition of the work namedThe School of Fakhr ad-Dīn ar-Rāzī which was written by Prof. Tuncay Başoğlu, was published within the scope of Late Classical Period Project by ISAM.

This study analyzes the School of Fakhraddin ar-Razi in the field of usûl al-fiqh and its views. This school had a major influence on the development of usûl literature in the late classic period of the Islamic civilization. The discourse and writing of the usûl of the period emerged as part of the developments that transformed the scientific mindset via Razi, his contemporaries and followers. The members of this school attached a special value to all intellectual sciences, primarily kalam and logic as a way of intellectual endeavor; they regarded usûl al-fiqh as a supreme science that combines intellectual and transmitted sciences, rebuilding it by using the language of metaphysics-logic and the tahqîq method.

The novelty introduced by the school in the writing of usûl al-fiqh had an impact that exceeded the limits of usûl al-fiqh. The basic approach Razi followed while re-building that science in his work,

al-Mahsul, which deeply aff ected the subsequent usûl writing, is to study the fiqh masâil with their all possible parts and probabilities, and document them based on tahqîq.

This study introduces Razi’s views on usûl, the literature that formed around al-Mahsul and seven jurisprudents from the Razi’s school, and describes the characteristics of the school’s views on usul and usul writing style.

In the expanded and revised third edition of the work, the findings of the studies on the subject since the first edition to the present is included, all chapters are reviewed, and the bibliographical information about the studies on the works of Rāzī, Qarafi and Baydawi, which was previously included in the text, is enriched and added to the end of the book.

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