produced the first coordinate transformation (Eddington–Finkelstein coordinates) that showed that the singularity at r = rs was a coordinate artifact, although...

that the event horizon was a coordinate singularity, not a physical one. (It can be removed by the Eddington–Finkelstein coordinates or the Kruskal–Szekeres...

791–858. Bibcode:1993RPPh...56..791N. doi:10.1088/0034-4885/56/7/001. Eddington, A. S. (9 May 1930). "On the Instability of Einstein's Spherical World"...