# sigma-ring　`def.sigma-ring`
English entry · root `../`
[in graph](../#n=def.sigma-ring)　·　[Chinese page (authoritative)](./def.sigma-ring.md)

> English: **name only** · auto-derived from the source data; the Chinese page is authoritative.

layer 3 · definition · cluster 集合族与 σ-代数 (`analysis.setclass`) · Analysis

## Statement and proof
Chinese only — see the Chinese page `nodes/def.sigma-ring.md` and `proofs/`.


Cite: `def.sigma-ring` (content v0.9.0) · terms: [LICENSE.txt](../LICENSE.txt)