Assertion: σ algebra | /r/HasProperty | collection
Facets:
value: in mathematical analysis
type: OTHER
value: in probability theory
type: OTHER
Source sentences:
text: In mathematical analysis and in probability theory, a σ-algebra (also σ-field) on a set X is a collection Σ of subsets of X that includes X itself, is closed under complement, and is closed under countable unions.