Proceedings of the 9th European summer university

The present volume contains the Proceedings of the 9th European Summer University on History and Epistemology in mathematics Education, held in Salerno, Italy, from 18 Jul 2022 to 22 Jul 2022.
We thank all the authors, and the Scientific Program Committee that made the realization of this work possible: Luis Carlos Arboleda, Janet Barnett, Aline Bernardes, Nathalie Chevalarias, Renaud Chorlay, Cecília Costa, Teresa Costa, Adriano Demattè, Olivera Đokić, Abdellah El Idrissi, Florence Fasanelli, Gail FitzSimons, Fulvia Furinghetti, David Guillemette, Masami Isoda, Ewa Łakoma, Snezana Lawrence, Po-Hung Liu, Maria Rosa Massa-Esteve, Iran Mendes, Frédéric Métin, Marc Moyon, Kosta Nikolantonakis, Antonio M. Oller-Marcén, Maurice O’Reilly, Johanna Pejlare, David Pengelley, Luis Puig, Peter Ransom, Leo Rogers, Sebastian Schorcht, Man-Keung Siu, Bjørn Smestad, Yi-Wen Su, Constantinos Tzanakis, Ysette Weiss, Greisy Winicki-Landman.