Some new equivalents of the Brouwer fixed point theorem

Authors : Sehie PARK

Pages : 300-309

Doi:10.31197/atnaa.1086232

View : 15 | Download : 14

Publication Date : 2022-09-30

Article Type : Research Paper

Abstract :This is to recollect the equivalent formulations of the Brouwer fixed point theorem. We collect a large number of recently known sources of such equivalents. More recently, Jinlu Li obtained two fixed point theorems on newly defined quasi-point-separable topological vector spaces. His theorems extend the Tychonoff fixed point theorem on locally convex t.v.s. However, we note that his new theorems are logically equivalent to the Brouwer fixed point theorem. Consequently, we add up our large list of such equivalents.
Keywords : Abstract convex space, KKM theorem, KKM class of multimaps, mathfrak A c^kappa, mathfrak B, mathfrak K, mathfrak KC, mathfrak KO