A combinatorial proof of a fixed point property

作者：Baclawski Kenneth^*

来源：Journal of Combinatorial Theory - Series A, 2012, 119(5): 994-1013.

DOI：10.1016/j.jcta.2012.01.004

• Fixed point property
• Dismantlable ordered set
• Lattice
• Noncomplemented lattice
• Straightening law

A class of finite simplicial complexes, called pseudo cones, is developed that has a number of useful combinatorial properties. A partially ordered set is a pseudo cone if its order complex is a pseudo cone. Pseudo cones can be constructed from other pseudo cones in a number of ways. Pseudo cone ordered sets include finite dismantlable ordered sets and finite truncated noncomplemented lattices. The main result of the paper is a combinatorial proof of the fixed simplex property for finite pseudo cones in which a combinatorial structure is constructed that relates fixed simplices to one another. This gives combinatorial proofs of some well known non-constructive results in the fixed point theory of finite partially ordered sets.

• 出版日期2012-7
• 单位东北大学