Formulas
- Representation theory of the Lorentz group
- Reptation
- Reshetnyak gluing theorem
- Residence time (statistics)
- Residue number system
- Residue theorem
- Resistance distance
- Resolvent cubic
- Resonance
- Return on equity
- Reverse mathematics
- Revised simplex method
- Revolutions per minute
- Reye configuration
- Reynolds number