- real domain
- real eigenvalue
- real element
- real ellipse
- real ellipsoid
- real elliptic cylinder
- real exponential function
- real expression
- real field
- real figure
- real flag manifold
- real form
- real function
- real function theory
- real general linear group
- real geometry
- real group
- real hyperbolic space
- real hypersphere
- real hypersurface
- realification
- realification character group
- realification projective space
- real integration
- real interpolation space