Vol. 30 Num. 2 (2010) Luis Radford The eye as a theoretician: seeing structures in generalizing activities ABSTRACT MORE INFORMATION 2 Wolff-Michael Roth Incarnation: radicalizing embodiment of mathematics ABSTRACT 8 Konstantinos Tatsis , Rijkje Dekker Combining approaches for the analysis of collaborative mathematics learning ABSTRACT 18 Kai-Lin Yang Communication: The potential of statement-posing tasks ABSTRACT 22 Lia Vaš , Timothy P. Enright Communication: Generalization of cross product to higher dimensions using geometric approach24 Sudan Hansraj Calculus free optimisation ABSTRACT 26 Miquel Albertí Palmer Situated mathematical research: the interaction of academic and non-academic practice ABSTRACT 32 - Contributor affiliations and contact information40