73 karma · joined January 9, 2018
UPD: okay, toggle lines is game-changer here, very nice!
Btw, why is it considered normal? I think it would be much better to mention an e-mail, to which you will have (more-or-less) permament access.
https://en.wikipedia.org/wiki/Snark_(graph_theory)
First is that "One of the equivalent forms of the four color theorem is that every snark is a non-planar graph". Second, is as strengthened form of the four color theorem: "every snark has the Petersen graph as a minor", which is kind of proven (already 25 years ago), but still lacks 1 paper: https://thomas.math.gatech.edu/FC/generalize.html https://math.stackexchange.com/questions/3692582/what-is-the...
And another related concept is of nowhere-zero flows, and even more stronger conjecture that "every bridgeless graph with no Petersen minor has a nowhere zero 4-flow". https://en.wikipedia.org/wiki/Nowhere-zero_flow
That's all nice, the problem is though that the market is in decline right now