Chris Impens @ Valvas
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28 July 2025
The magic square of 1/19
26 July 2025
Ulam's Spiral in GeoGebra
09 September 2024
Euclid's axioms and constructions revisited
18 August 2024
Pascal's Hexagram Theorem, an exercise in determinants
12 April 2024
An image of the number PI
09 September 2021
Why sunflowers display Fibonacci and Lucas numbers
24 August 2021
Solving the cubic and quartic equations
22 March 2021
Mathematical equation of a sunflower head
17 February 2021
Golden Maths — Elementary arithmetic
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