sigma algebras generated by a set
51134
If $E \in \sigma(\mathcal{C})$ then there exists a countable subset $\mathcal{C}_0 \subseteq \mathcal{C}$ with $E \in \sigma(\mathcal{C}_0)$
13779
Canonical copies of sets
146951
Every countably generated sigma algebra is generated by a random variable
29637
$\sigma$-algebra of sets that are both $G_\delta$ and $F_\sigma$
81843
Sequences of sets property
147486
Cartesian product of two $\sigma$-algebras is generally not a $\sigma$-algebra?
81327
union of sigma algebra is sigma algebra
19289
complement of a set and its measure
55717
cardinality of the Borel $\sigma$-algebra of a second countable space
157412
Left cosets and right cosets
45939
For which $n≥2$ does there exist $\sigma\in A_n$ with $|\sigma| > n$
41448
Counting set for generating functions
34964
Recursive representation of closed sets in Baire Space ($\Sigma^1_1$)
44480
Let $\sigma :\{1,2,3,4,5\} \rightarrow \{1,2,3,4,5\}$ be permutations such that $ \sigma^{-1}(j) \leq \sigma(j)~\forall j, 1 \leq j \leq 5$.
65098
Number of $\sigma$  -Algebra on the finite set
35140
Existence of minimal $\sigma$-algebra and transfinite induction
68512
$\sigma$ algebra of collection of random variables