Vol. 40 Num. 2 (2020) - front cover0 Christian Büscher Scaling up qualitative mathematics education research through Artificial Intelligence methods ABSTRACT 2 Vilma Mesa , Angeliki Mali Studying student actions with dynamic textbooks in university settings: the log as research instrument ABSTRACT 8 Mika Gabel , Tommy Dreyfus Analyzing proof teaching at the tertiary level using Perelman’s New Rhetoric ABSTRACT 15 Amir Asghari Communication: In praise of the minus sign20 Mario Sánchez Aguilar Communication: A post publishing discussion in mathematics education research is needed22 Emilia Florio , Luigi Maieru' , Giuseppina Fenaroli Communication: The construction of regular polygons between geometry and algebra: a didactic-historical example23 From the archives Communication: From the archives24 Laurinda Brown Communication: Remembering Ros25 Celia Hoyles Communication: Enduring challenges26 Teresa Rojano Communication: Long collaborations and lasting impacts26 Janet Walkoe , Mariana Levin Seeds of algebraic thinking: towards a research agenda ABSTRACT 27 Hwa Young Lee , Hamilton L. Hardison , Teo Paoletti Foregrounding the background: two uses of coordinate systems ABSTRACT 32 Kathleen Melhuish , Jennifer A. Czocher Division is pretty much just multiplication ABSTRACT 38 - Contributors44
