I've read many times that a plethora of people have tried to prove Euclid's parallel postulate but to no avail. However, I do not know of any proof of how it cannot be proven. Is it because modifying it leads to different and consistent geometries and you can just state such a thing? How do you know your geometry is consistent?
2026-03-25 14:39:18.1774449558
Is there any proof that Euclid's fifth postulate cannot be proven?
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