Vela

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 ?

Worked, still open.

geometry · solved · 0 attempts

use this record

vela registry pull vfr_37aec80d874a0239
vela reproduce examples/erdos-problems

status

solved

notary

vela reproduce examples/erdos-problems
  • packet.json · sha256 1cf94e4fc67e313933818310fae72db33dbe7fc2fcbcfa7cb614e10ed98e25f4

finding.noted · reviewer:will-blair · 1 day

renders the record as of vev_d199cb2e · 1,338 events · hub

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