An affine vector field (sometimes affine collineation or affine) is a projective vector field preserving geodesics and preserving the affine parameter. Mathematically, this is expressed by the following condition:
See also
- Conformal vector field
 - Curvature collineation
 - Homothetic vector field
 - Killing vector field
 - Matter collineation
 - Spacetime symmetries
 
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