Countable $\sigma$-algebra
117133
Is there an infinite countable $\sigma$-algebra on an uncountable set
118595
Proving that a set is countable by finding a bijection
65098
Number of $\sigma$  -Algebra on the finite set
144359
A random variable that induces a $\sigma$-algebra the same as the one in the sample space
23442
Cardinality of the union of infinite and countable sets
153306
Number of sigma algebras for set with 4 elements
51134
If $E \in \sigma(\mathcal{C})$ then there exists a countable subset $\mathcal{C}_0 \subseteq \mathcal{C}$ with $E \in \sigma(\mathcal{C}_0)$
92005
Existence of compact/complete metric on countable set
94438
Show that the countable product of metric spaces is metrizable
120442
Prove Borel sigma-algebra translation invariant
76240
How is $\epsilon_0$ countable?
7681
How can this theorem about weakly measurable functions on $\sigma$-finite measure spaces be deduced from the finite measure space case?
130981
Co-countable measure on uncountable set
147486
Cartesian product of two $\sigma$-algebras is generally not a $\sigma$-algebra?
99599
Uncountable and countable
52429
Explicit countable elementary extension of $\mathbb{N}$
55157
$\sigma$-algebras on a countable set is generated by partitions of the set