Formulas
- Real-root isolation
- Real closed field
- Real coordinate space
- Real number
- Real projective space
- Reciprocal gamma function
- Rectangular mask short-time Fourier transform
- Recurrent tensor
- Reduction (mathematics)
- Reflexive relation
- Cerf theory
- Chain complex
- Champernowne constant
- Chan–Karolyi–Longstaff–Sanders process
- Chaos game