Formulas
- Day length fluctuations
- De Morgan's laws
- De Sitter invariant special relativity
- Deborah number
- Decision list
- Decomposition of spectrum (functional analysis)
- Default logic
- Deficiency (graph theory)
- Deficit round robin
- Degree diameter problem
- Degree of curvature
- Del in cylindrical and spherical coordinates
- Σ-algebra
- Dependent and independent variables
- Deposition (aerosol physics)