Suppose we have a ring $R$ and $r \in R$ with the property that $\lambda(r)<\infty$. Where $\lambda$ is a $\sigma$-finite pre-measure. Why do we find $Y \in \sigma(R)$ so that $ Y \subset r$ is true?
2026-04-26 01:10:56.1777165856
Sets in a ring that are subset of another set in the ring
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