- An Introduction to PCV (Proportional Co-Variation)
- Re-Directing Descartes' 1637 Multiplication Part 1
- Descartes' 1637 Multiplication Part 2
- Multiplication on the Reals with a Circle
- Division on the Reals with a Circle
- Podo Rings
- Proportional Co-Variation: Multiplication on the Reals
- Extracting a Square Root with a Semi Circle
- The Butterfly Effect (Euclid Elements III, P.35)
- Power of a Point Theory of Jacob Steiner
- Why Positive Reals have 2 square roots