On forbidden minors for ๐บ๐น(3)
Jeff Kahn, Paul D. Seymour ยท Proceedings of the American Mathematical Society ยท 1988
A new, surprisingly simple proof is given of the finiteness of the set of matroids minor-minimally not representable over G F ( 3 ) GF(3) . It is, in fact, proved that every such matroid has rank or corank at most 3.