Formulas
- Affine Grassmannian (manifold)
- Affine combination
- Affine geometry
- Affine geometry of curves
- Affine hull
- Affine monoid
- Change of basis
- Chaos theory
- Character theory
- Characteristic (algebra)
- Characteristic equation (calculus)
- Characteristic subgroup
- Characterizations of the exponential function
- Charles Fefferman
- Charles Jean de la Vallée Poussin