The August issue of ZDM is available, and it has a special focus on "Didactical and Epistemological Perspectives on Mathematical Proof". This issue contains 14 articles:

- Introduction to the special issue on didactical and epistemological perspectives on mathematical proof, by Maria Alessandra Mariotti and Nicolas Balacheff
- Proofs as bearers of mathematical knowledge, by Gila Hanna and Ed Barbeau
- Proof as a practice of mathematical pursuit in a cultural, socio-political and intellectual context, Man-Keung Siu
- Theorems that admit exceptions, including a remark on Toulmin, by Hans Niels Jahnke
- Truth versus validity in mathematical proof, by Viviane Durand-Guerrier
- Argumentation and algebraic proof, by Bettina Pedemonte
- Indirect proof: what is specific to this way of proving?, by Samuele Antonini and Maria Alessandra Mariotti
- Students’ encounter with proof: the condition of transparency, by Kirsti Hemmi
- A method for revealing structures of argumentations in classroom proving processes, by Christine Knipping
- Strategies to foster students’ competencies in constructing multi-steps geometric proofs: teaching experiments in Taiwan and Germany, by Aiso Heinze, Ying-Hao Cheng, Stefan Ufer, Fou-Lai Lin and Kristina Reiss
- Reasoning and proof in geometry: effects of a learning environment based on heuristic worked-out examples, by Kristina Maria Reiss, Aiso Heinze, Alexander Renkl and Christian Groß
- When, how, and why prove theorems? A methodology for studying the perspective of geometry teachers, by Patricio Herbst and Takeshi Miyakawa
- DNR perspective on mathematics curriculum and instruction, Part I: focus on proving, by Guershon Harel
- The role of the researcher’s epistemology in mathematics education: an essay on the case of proof, by Nicolas Balacheff

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