“…When, after finishing his course of study, he became a teacher, he suddenly found himself expected to teach the traditional elementary mathematics in the old pedantic way; and, since he was scarcely able, unaided, to discern any connection between this task and his university mathematics, he soon fell in with the time honoured way of teaching, and his university studies remained only a more or less pleasant memory which had no influence upon his teaching. (Felix Klein, 1908, referred to in Winsløw & Grønbaek, 2014 Nevertheless, it is still a focus of interest in the field, as it is reported in various studies (Leikin et al, 2018;Suominen, 2018;Ticknor, 2012;Wasserman, 2018;Weber et al, 2020;Yan et al, 2021). Leikin et al (2018) conducted a study with mathematics teachers from teacher training courses at Israeli universities.…”