3 ms·
I believe elliptic geometry is a subset, it's spherical geometry that isn't (though it's closely related).
by roywiggins 5y ago
I believe elliptic geometry is a subset, it's spherical geometry that isn't (though it's closely related).
- red_trumpet 5y agoReading the Wikipedia entry about Hilbert's axioms [1], I think spherical geometry is not absolute, because two opposing points lie on many lines connecting the two (think north and south pole, connected by all the meridians). [1] https://en.wikipedia.org/wiki/Hilbert%27s_axioms https://en.wikipedia.org/wiki/Hilbert%27s_axioms