Formulas
- Riemannian submersion
- Riesel number
- Rigidity (mathematics)
- Local time (mathematics)
- Ring (mathematics)
- Locally convex topological vector space
- Ring theory
- Root mean square
- Schwarz reflection principle
- Smash product
- Stanley's reciprocity theorem
- Sub-Riemannian manifold
- Ternary relation
- Time reversibility
- Variance reduction