Rational Approximation
- Badly Approximable
- Dirichlet's Approximation Theorem
- Freiman's Constant
- Hurwitz's Irrational Number Theorem
- Kronecker's Approximation Theorem
- Lagrange Number
- Lagrange Spectrum
- Liouville's Approximation Theorem
- Littlewood Conjecture
- Rational Approximation
- Roth's Theorem
- Segre's Theorem
- Siegel's Theorem
- Strang's Strange Figures