Formulas
- Foster cage
- Foster graph
- Foundations of geometry
- Foundations of mathematics
- Four-spiral semigroup
- Four color theorem
- Four exponentials conjecture
- Contou-Carrère symbol
- Contour set
- Fourier inversion theorem
- Contraction mapping
- Contraction principle (large deviations theory)
- Contradiction
- Contraposition
- Fourier transform on finite groups