- real orthogonal group
- real pair
- real parameter
- real part
- real plane
- real polarization
- real polynomial
- real prime divisor
- real process
- real projective plane
- real projective space
- real quadratic field
- real quadratic form
- real quaternion
- real random variable
- real-rank
- real representation
- real root
- real rotation group
- real sequence
- real series
- real solution
- real space
- real spectral measure
- real spectrum