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The Faculty of Mathematics and Natural Sciences awards the doctoral degree Doctor of Philosophy in Natural Sciences (Ph.D., in German: Doktor der Naturwissenschaften, doctor rerum naturalium, Dr. rer. nat.)  based on a written and published doctoral thesis (dissertation) and an oral examination (disputation / thesis defense) in a subject of mathematics and natural sciences.
The doctorate can be achieved in a graduate program or in the form of an individual doctorate. All doctoral candidates become members of the Graduate School of the respective department or are recommened to join the Graduate School for Teacher Education.
The doctoral project must first be registered and approved by the Faculty before enrollment as a doctoral student is possible. 

The doctoral office in the Dean's office  will only advise on formal aspects of the doctoral program. Subject-specific questions need to be addressed to the graduate school and the supervisor.