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Question: question from the projective geometry axioms prove that two distinct...

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QUESTION: From the projective geometry axioms, prove that two distinct lines have exactly one point in common.

Axioms of projective geometry:

1. a line is on at least two points

2. any two distinct points have exactly one line in common

3. any two distinct lines have at least one point in commom (parallel line one)

4. there is a set of four distinct points, no three of which are collinear.

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