@npub1f9kn3...
"When the derivation of General Relativity is examined carefully, it is found to contain a fundamental error of a type which would not have been tolerated if it had been made by a college freshman who was studying Calculus. Even with that error, the truth of the basic premises of General Relativity (the Principles of Relativity and of Equivalence) insured the error would not be revealed by observations made in the weak gravitational field of the Sun or by observations of a distant binary star system. In order to partially compensate for the effects of his mathematical error, Dr. Einstein introduced the artificiality of curved space. This concept has had the unfortunate effect of leading a large number of highly trained astronomers and cosmologists down the garden path and led to the absurdities of Black Holes, Wormholes, and Singularities. Dr. Einstein may have recognized the existence of a defect(s) in General Relativity since he is reported to have been uneasy about its extension into regions of intense gravitational fields."
https://annas-archive.org/md5/bbbc6ad506ea4ef8853a9ec28330d317
"When the derivation of General Relativity is examined carefully, it is found to contain a fundamental error of a type which would not have been tolerated if it had been made by a college freshman who was studying Calculus. Even with that error, the truth of the basic premises of General Relativity (the Principles of Relativity and of Equivalence) insured the error would not be revealed by observations made in the weak gravitational field of the Sun or by observations of a distant binary star system. In order to partially compensate for the effects of his mathematical error, Dr. Einstein introduced the artificiality of curved space. This concept has had the unfortunate effect of leading a large number of highly trained astronomers and cosmologists down the garden path and led to the absurdities of Black Holes, Wormholes, and Singularities. Dr. Einstein may have recognized the existence of a defect(s) in General Relativity since he is reported to have been uneasy about its extension into regions of intense gravitational fields."
https://annas-archive.org/md5/bbbc6ad506ea4ef8853a9ec28330d317