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submitted 1 week ago by [email protected] to c/[email protected]
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[-] [email protected] 2 points 1 week ago

Euclid's first postulate: Give two points, there exists exactly one straight line that includes both of them.

[-] [email protected] 4 points 1 week ago

This only applies in 2nd order real space. Euclidean geometry aside, I agree with at least one line could exist between two points

[-] [email protected] 2 points 1 week ago

Counterexample: North and Southpole on Earth.

[-] [email protected] 1 points 6 days ago

No, it's still accurate - the straight line goes through the center of the Earth. Only in coordinate systems where 'straight' is defined as following the curvature of a surface are there infinite lines between the North and South Poles... and that would be non-Euclidean geometry.

this post was submitted on 08 Jun 2025
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