Random Sperner lemma and random Brouwer fixed point theorem

Abstract: In this paper, we systematically develop the theory of $L^{0}$-simplicial subdivisions of $L^{0}$-simplexes by grasping the inherent connection between $L^{0}$-simplexes and usual simplexes. We establish a key representation theorem of a proper $L^0$-labeling function by usual proper labeling functions. Based on the representation theorem, we can establish a general random Sperner lemma. Next, as an application of the random Sperner lemma, we give a complete proof of the known random Brouwer fixed theorem in random Euclidean spaces. Besides, all the works currently available and closely related to the randomization of the classical Brouwer fixed point theorem are unified.