David's Diophantine Demystified David's Diophantine Demystified

Demystifying Diophantine Approximation

From intuitive insights to deep theory — learn how well real numbers can be approximated by rationals, why it matters, and how it powers real-world applications.

Example Statement

Dirichlet's theorem: For any real x and positive integer Q, there exist integers p, q with 1 ≤ q ≤ Q such that

$$\left|x - \frac{p}{q}\right| < \frac{1}{qQ}$$

About David

Teacher, mathematician, and engineer — committed to making advanced ideas accessible to everyone.

Learn more →

Diophantine Approximation, Simply

A friendly introduction with pictures, intuition, and just enough math.

Read the basics →

Advanced Topics

The full story: precise statements, proofs sketches, and references.

Explore advanced →