Dynkin system
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A Dynkin system,[1] named after Eugene Dynkin, is a collection of subsets of another universal set satisfying a set of axioms weaker than those of 饾湈-algebra. Dynkin systems are sometimes referred to as 饾渾-systems (Dynkin himself used this term) or d-system.[2] These set families have applications in measure theory and probability.
A major application of 饾渾-systems is the 蟺-饾渾 theorem, see below.