When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Yanpei (applied mathematics, Northern Jiaoton U., Beijing) discusses a variety topics concerned with the isomorphisms of polyhedra, surface embeddability, problems concerning graphic and cographic matroids and knot problems from topology to combinatorics.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.