I never got beyond calculus in school, and I’ve heard this term thrown around by smart math and science people bit have no clue what it means or why it’s special.
In: Mathematics
Normal Euclidean geometry is on a flat surface, think a piece of paper. Where things like angles in a triangle always add up to 180 degrees.
Non-euclidean geometry is just geometry on a curved surface. Usual examples are a sphere or a horse saddle shaped plane. For example you can make a triangle with 3 90° corners, breaking the previously mentioned triangle rule.
Because of this you do things you otherwise couldn’t do in Euclidean geometry.
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