Erdős problem 209
Let be a finite collection of non-parallel lines in such that there are no points where at least four lines from meet. Must there exist a 'Gallai triangle' (or 'ordinary triangle'): three lines from which intersect in three points, and each of these intersection points only intersects two lines from ?
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- sha256:c1ff9182315e6ec00e6132945c72498dbb246a97cd7287a5e055b60dca5a2de4
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- sha256:8c823d621b7e1256c8e47c60a5f1c54c016a5507e6f27b2bab537f6f5f232067
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- 2415f78e850aeee50afdca525c6f2e0ea606f207