Ferdinando Arzarello, Professor Emeritus of the Department of Mathematics of the University of Turin, Italy
My abductions, deductions and (not only semiotic) mediations with Maria Alessandra
Nicolas Balacheff, DR CNRS Emeritus, Laboratoire LIG, Grenoble, France
Unfolding the systemic nature of theorem: A tribute to Maria Alessandra Mariotti's epistemological clear-sightedness
Paolo Boero, University of Genoa, Italy
Rethinking cognitive unity of theorems in the perspective of Habermas' rationality
Celya Hoyles and Richard Noss, University College London, UK
Digitally-mediated mathematical meanings: the contribution of Maria Alessandra Mariotti
Colette Laborde, Cabrilog, France
Drawing tools for learning geometry: some aspects of the contribution of digital technologies
