Early adolescents' proportional reasoning on ‘rate’ problems Robert KarplusSteven PulosElizabeth K. Stage OriginalPaper Pages: 219 - 233
Spontaneous mathematization of situations outside mathematics G. Trelinski OriginalPaper Pages: 275 - 284
The topological primacy thesis: Genetic and didactic aspects Wilhelm Schipper OriginalPaper Pages: 285 - 296
Simplification and complexity in mathematics education H. B. Griffiths OriginalPaper Pages: 297 - 317