Infinite collection of infinite sets whose union converges to a defined set?
107614
Partitioning an infinite set
33157
Proof that an infinite subset of $\mathbb{N}$ is countable
48797
Proving Two Sets are Equal - Infinite Sets - Example
122947
What is the cardinality of the set of infinite cardinalities?
104550
Countable union of countable sets(ZF)
3404
What are the convergent sequences in the cofinite topology
157513
How can I prove that these sets are countable infinite?
55614
Prove that a set consisting of a sequence and its limit point is closed
7733
If A is infinite, does there have to exist a subset of A that is equivalent to A?
31969
Partition of N into infinite number of infinite disjoint sets?
81509
The cardinality of a countable union of countable sets, without the axiom of choice
154578
Proving there is a sequence convergent to a limit point of a set without axiom of countable choice?
89506
Union of disjoint sets : Equivalence relations
139826
arbitrary large finite sums of an uncountable set.
32630
Proving that a set in which any sequence having exactly one accumulation point converges is compact
63276
Is an arbitrary union of a chain of countable sets countable?
44974
Infinite set and countable subsets