ThmDex – An index of mathematical definitions, results, and conjectures.

▼	Set of symbols
▼	Alphabet
▼	Deduction system
▼	Theory
▼	Zermelo-Fraenkel set theory
▼	Set
▼	Subset
▼	Power set
▼	Hyperpower set sequence
▼	Hyperpower set
▼	Hypersubset
▼	Subset algebra
▼	Subset structure
▼	Topological space
▼	Open set
▼	Standard open real function set

Definition D5007

Standard open euclidean real set