Source: wikibot/dynkin-system
= Dynkin system
{wiki=Dynkin_system}
A Dynkin system (also known as a π-system or a Dynkin π-system) is a collection of sets that satisfies certain properties, making it useful in measure theory and probability. Specifically, a collection \\( \\mathcal\{D\} \\) of subsets of a given set \\( X \\) is called a Dynkin system if it satisfies the following properties: 1. **Contains the entire set**: \\( X \\in \\mathcal\{D\} \\).