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Not in Euclidean Geometry.

Euclid's 5th axiom is that parallel lines never meet. However, unlike the first 4 axiom, it is impossible to prove the 5th axiom; depending upon the situation, you can either assume that parallel lines meet or don't; when they do meet, there are some very interesting consequences (for example, the possibility of a hyperbolic space).

To my knowledge, if they meet, they are intersecting/perpendicular lines.

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16y ago

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