Where am I making a mistake in showing that countability isn't a thing?
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
58253
Why does is_constructible claim something is constructible when it isn't?
32774
Finite Cartesian Product of Countable sets is countable?
37398
Proof that$ (a+A)\cap A=\varnothing$ if $A$ is countable
14994
Showing a function $f$ cannot be surjective
144463
Can a material noun be countable?
100333
Show A is countable infinity
7607
How to prove that $\mathbb{Q}$ is not the intersection of a countable collection of open sets.
51877
Why is this 'Proof' by induction not valid?
78290
Countable axiom of choice: why you can't prove it from just ZF
46967
What is wrong with this proof that the power set of natural numbers is countable?
146891
Why is $\{\emptyset\} \not = \emptyset$?
88433
Listing differnet kinds of an uncoutable noun. Are they countable or uncountable?
39351
$f(X)$ is uncountable and hence $X$ is uncountable.
52682
Is the power set of the natural numbers countable?
136006
Prove that any countable cartesian product of countable sets is countable
155777
Show that infinite Cartesian product is uncountable