Countdown towards the singularity Kurzweil touches on the record on the singularity notion, tracing it back to John von Neumann within the fifties and I. for a black hole of mass M. Black holes Using the minimum possible mass satisfying this inequality are known as extremal. Remedies of Einstein's equations https://sparxsocial.com/story8516757/the-definitive-guide-to-singularity-econopass-article