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