3 Configurations of 9 Lines with 3 Intersection Points on each Line
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This theorem requires a proof.
The precise meaning of the term "essentially different" needs to be established, for a start
You can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by crafting such a proof.
Theorem
There exist exactly $3$ essentially different configurations of $9$ straight lines each of which has exactly $3$ points of intersection.
This is one: there are two others.
Proof
The precise meaning of the term "essentially different" needs to be established, for a start
You can help $\mathsf{Pr} \infty \mathsf{fWiki}$ by crafting such a proof.
When this page/section has been completed, {{ProofWanted}} should be removed from the code.
If you would welcome a second opinion as to whether your work is correct, add a call to {{Proofread}} the page (see the proofread template for usage).
Also see
Sources
- 1986: David Wells: Curious and Interesting Numbers ... (previous) ... (next): $9$
- 1997: David Wells: Curious and Interesting Numbers (2nd ed.) ... (previous) ... (next): $9$