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sigma-álgebra archivos - El blog de Leo

prove or disprove that union of two sigma algebra is a sigma algebra 32673

SOLVED:If ℳ is the σ-algebra generated by ε, then ℳ is the union of the σ-algebras generated by ℱ as ℱ ranges over all countable subsets of ℰ. (Hint: Show that the latter object is a σ-algebra.)