Template:MT book:C1:statements:Proposition1.1

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A class ๐’œ⊆๐’ซ(X) is an algebra if and only if ๐’œ satisfies :

  1. X∈๐’œ
  2. ∀A∈๐’œ⇒Ac∈๐’œ
  3. ∀A,B∈๐’œ⇒A∩B∈๐’œ
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