A bogus proof of countable power set
1318
What is wrong with this proof that the power set of the natural numbers is countable?
34998
How to prove that $\mathbb{Q}$ ( the rationals) is a countable set
68230
The cardinality of a countable union of sets with less than continuum cardinality
142267
If two sets have the same cardinality, then so do their power sets. Converse can't be answered?
125683
Power set of a finite set is finite proof, no cardinality of power set
114770
Proof that a perfect set is uncountable
145214
Showing the power set is equinumerous to ${}^X2$
33157
Proof that an infinite subset of $\mathbb{N}$ is countable
155777
Show that infinite Cartesian product is uncountable
81509
The cardinality of a countable union of countable sets, without the axiom of choice
18223
Prove that the union of two disjoint countable sets is countable
128437
How to prove that a finite set is countable
78290
Countable axiom of choice: why you can't prove it from just ZF
41192
Neatest proof that set of finite subsets is countable?
84936
The set of all finite sequences of members of a countable set is also countable
83778
An incorrect proof by exhaustion
33894
How many chains are there in a finite power set?