Role of Axiomatization in Math & Math Ed
Discrete Mathematics in the Modern World
Designing Middle School Math Materials Using Problems in Context
What is Proof?
Calculus Students' Use & Interpretation of Variables
Learning to Think Mathematically by Schoenfeld
Research Evidence on Hierarchical Thinking, Teaching Strategies & the Van Hiele Theory
Misconceptions in Math & Diagnostic Teaching
The role and function of proof in mathematics
'n Veralgemening van Pythagoras se stelling
A further generalization of the Fermat-Torricelli point
A unifying generalization of Turnbull's theorem
A dual to Kosnita's theorem
Mathematical Treasure Hunting
Anecdotes From the History of Mathematics
A generalization of the Spieker circle and Nagel line
Math by Experiment
Relational and Instrumental Understanding - Powerpoint
ICME12 Understanding Math Usiskin
Conceptual Analysis of Mathematical Ideas by Thompson