Formulas
- Additive polynomial
- Additively indecomposable ordinal
- Adele ring
- Adequate equivalence relation
- Adherent point
- Adjoint bundle
- Adjoint functors
- Adjunction formula
- Adjunction space
- Category of manifolds
- Category of sets
- Cauchy's theorem (group theory)
- Cauchy distribution
- Cauchy principal value
- Cauchy product