Formulas
- Diagonal morphism
- Diagonal subgroup
- Diagram (category theory)
- Diamagnetic inequality
- Dickson's lemma
- Dieudonné's theorem
- Diffeology
- Diffeomorphism
- Difference algebra
- Difference of two squares
- Difference polynomials
- Differential-algebraic system of equations
- Differential (mathematics)
- Differential Galois theory
- Differential calculus over commutative algebras