Ideas, explained

Interactive lessons for people who build software.

Practical engineering notes and guided mathematics courses designed to move you from definitions to working intuition.

Featured series

Mathematics for software engineers

11-module interactive course

Prime Fields, From First Principles

Understand modular arithmetic, inverses, Fermat's little theorem, primitive roots, and equations over prime fields.

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A Visual Guide to Finite Fields

Explore field axioms, extension fields, irreducible polynomials, Frobenius orbits, and subfield lattices.

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