摘要
In this paper, some properties of the image of the geometric lattice of a graphic matroid under a strong map are discussed, and a negative answer to the related open question of Welsh’s book is given.
In this paper, some properties of the image of the geometric lattice of a graphic matroid under a strong map are discussed, and a negative answer to the related open question of Welsh's book is given.
基金
Foundation item:The NSF(99SL02)of Shaanxi Province and the SF(20609)of China for Postdoctoral Fellow.
