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A comment on Strangeness of Black Holes. Parent comment

Re:Strangeness of Black Holes by ben_w on Friday January 18, 2019 @09:15AM (#18939398)
The ancient Greeks put the “Euclid” into “Euclidian geometry”. It took until about 1813 for that to be replaced with non-Euclidian geometry, and everything that makes General relativity really interesting is non-Euclidian.
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Re:Strangeness of Black Holes by dr_dshiv on Friday January 18, 2019 @05:41PM (#18943815)
Keep in mind that the first 28 postulates of Euclid remain valid even in non Euclidean geometry. Even Euclid had to invoke another principle to clarify the 29th, which is now seen as an optional principle.

http://mathworld.wolfram.com/EuclidsPostulates.html

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