2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/104850Describing minimal generating sets of toric ideals is a well-studied and difficult problem. Neil White conjectured in 1980 that the toric ideal associated to a matroid is generated by quadrics corresponding to single element symmetric exchanges. We give a combinatorial proof of White's conjecture for graphic matroids.19 pages, 4 figuresCombinatoricsRings and Algebras05B35 (Primary) 05C05 (Secondary)text