👉 The term "holmgang" is a well-known and widely recognized concept in mathematics, specifically in the field of algebraic topology. It refers to an ordered triple (X, U, C) where X is a topological space, U is an open set in X, and C is a closed subset of X that contains all points of X not in U. In essence, "holmgang" describes a set X equipped with three additional structures: 1. An ordered triple (X
