Euclid’s Elements, Pasch’s Axiom

For centuries, the gold standard for mathematical reasoning wasn’t just inspired by Euclid’s Elements – it was Euclid’s Elements. Compiled around 300 BCE, this monumental 13-book collection systematically derived a vast body of geometry and number theory from a small set of explicit starting points. It begins with fundamental plane geometry (Book I covers basic […]

Volumes of Spheres

When we first learn geometry, spheres feel completely intuitive. A circle in the plane. A ball in three-dimensional space. Everything is visual. High-dimensional geometry behaves in ways that feel almost paradoxical. Volumes shrink, surfaces dominate interiors, and many familiar formulas suddenly depend on special functions like the Gamma function. Understanding why requires stepping away from […]