In functional analysis, a branch of mathematics, a bounding point of a subset of a vector space is a conceptual extension of the boundary of a set.
Definition Let A {\displaystyle A} be a subset of a vector space X {\displaystyle X} . Then x ∈ X {\displaystyle x\in X} is a bounding point for A {\displaystyle A} if it is neither an internal point for A {\displaystyle A} nor its complement.
References