Editors

EDITOR-IN-CHIEF
Ewa Swoboda (University of Rzeszow, Rzeszów, Poland )
ADVISOR EDITOR
Stefan Turnau (Professor Emeritus, University of Rzeszow, Rzeszów, Poland)
EDITORS
Marianna Ciosek (Professor Emeritus, Pedagogical University of Krakow, Kraków, Poland) 
Agnieszka Demby (University of Gdańsk, Gdańsk, Poland)
Zbigniew Semadeni (Professor Emeritus, University of Warsaw, Warszawa, Poland)
Anna Katarzyna Żeromska (AGH University of Science and Technology  in Krakow, Kraków, Polad)
Lidia Zaręba (Pedagogical University of Krakow, Kraków, Poland) - SECRETARY
EDITORIAL BOARD
Andreas Ambrus (Professor Emeritus, University of Budapest, Budapest, Hungary)
Michele Artigue (Université Paris Diderot, Paris, France)
Ferdinando Arzarello(Università degli Studi di Torino, Torino, Italy)
Claire Vaugelade Berg (University of Agder, Kristiansand, Norway)
Roman Duda (Professor Emeritus, University of Wrocław, Wrocław, Poland)
Ingvald Erfjord (University of Agder, Kristiansand, Norway)
Simon Goodchild (University of Agder, Kristiansand, Norway)
Milan Hejný (Professor Emeritus, Charles University, Prague, Czech Republic)
Marja van den Heuvel-Panhuizen (Universiteit Utrecht, Utrecht, The Netherlands)
Alena Hospesova (Jihoceska Univerzita, České Budějovice, Czech Republic)
Oleg Ivanov (St. Petersburg State University, St.Petersburg, Russia)
Barbara Jaworski (Mathematics Education Centre, Loughborough University, United Kingdom)
Alexander Karp (Teachers College, Columbia University, New York, United States of America)
Jeremy Kilpatrick (Professor Emeritus, College of Education, The University of Georgia, United States of America)
Konrad Krainer (Institute of Instructional and School Development, Universität Klagenfurt, Austria)
Alain Kuzniak (Université Paris Diderot, Paris, France)
Ladislav Kvasz (Charles University, Prague, Czech Republic)
Joanna Mamona-Downs (University of Patras, Department of Mathematics, Patra, Greece)
Carlo Marchini(Professor Emeritus, Mathematics Department,University of Parma, Italy)
Edyta Nowińska (A. Mickiewicz University, Poznań, Poland)
Ryszard Pawlak (University of Łódź,  Łódź, Poland)
Susanne Prediger (TU Dortmund University Dortmund, Germany)
Bettina Rösken-Winter (Humboldt-Universität zu Berlin, Berlin, Germany)
Anna Sierpinska, (Concordia University, Quebec, Canada)
Mihaela Singer (University of Ploiesti, Ploieşti, Romania)
Michal Tabach (Tel Aviv University, Israel)
Konstantinos Tatsis (University of Ioannina, Ioannina, Greece)
Marie Ticha (Institute of Mathematics of the Academy of Sciences of the Czech Republic, Praha, Czech Republic)
Dina Tirosh (Tel Aviv University, Israel)
Wacław Zawadowski (Professor Emeritus, University of Warsaw, Warszawa, Poland)
STATISTIC REDACTOR
Lech Zaręba (University of Rzeszów, Rzeszów, Poland)
THEMATIC REDACTOR
Marta Pytlak (University of Rzeszów, Rzeszów, Poland)
Bożena Maj-Tatsis (University of Rzeszów, Rzeszów, Poland)