Hidden dimensions in the professional development of mathematics teachers [Elektronische Ressource] : in-service education for and with teachers / von Bettina Rösken

Hidden Dimensions in the Professional Development of Mathematics Teachers - In-Service Education for and with Teachers Vom Fachbereich Mathematik der Universität Duisburg-Essen zur Erlangung des akademischen Grades eines Dr. rer. nat. genehmigte Dissertation von Bettina Rösken aus Moers Referent: Prof. Dr. Günter Törner Korreferent: Prof. Dr. Bharath Sriraman Tag der mündlichen Prüfung: 23.03.2009Acknowledgment This work would not have been possible without the extraordinary support by many persons. First, I wish to express my gratitude to my long-time teacher and supervisor Prof. Dr. Günter Törner, who has accompanied my work as a researcher and as a friend. He has offered exceptional opportunities to meet and work with experts from all over the world. Second, my most profound thanks address Prof. Dr. Bharath Sriraman for the helpful and encouraging comments on this work, and the support he has always supplied. I like to thank my dear colleague Prof. Dr. Katrin Rolka for the many discussions we had ahead of this work, the many experiences we have shared, and the inspiring commentaries she has always provided. Also, I like to thank my colleagues at the mathematics department of the University of Duisburg-Essen. For their fellowship, I wish to thank Verena Gondek, Miriam Dieter and my students Britta Berndsten, and Daniel de Byl.