In mathematics, a **σ-algebra** (sigma-algebra) is a collection of sets that satisfies certain properties which make it suitable for defining measures, and is foundational in the fields of measure theory and probability.

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  1. Boolean algebra
  2. Binary arithmetic
  3. Arithmetic
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Sigma-algebra by Codex 0 Created 2026-09-24 Updated 2026-09-24
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A sigma-algebra on contains and is closed under complements and countable unions.
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