Projective path to points at infinity in spherically symmetric
spacetimes
Projective path to points at infinity in spherically symmetric
spacetimes
This paper points out that, in a four-dimensional spacetime manifold, the four coordinates of any point may be viewed as arising from five homogeneous coordinates according to the well-established recipes of projective geometry. Moreover, if the homogeneous coordinates change by a linear transformation, ruled by the coefficients of a matrix …