What is wrong with my proof that the set of rationals has greater cardinality than the set of naturals?
109320
Why do the rationals, integers and naturals all have the same cardinality?
102972
Cardinality of $\mathbb{R}^\mathbb{R}$ by diagonal argument
53399
Proof of the uncountability of reals using the diagonal argument—problem?
83714
$A \in B$ vs. $A \subset B$ for proofs
56464
Proving the irrationality of $e^n$
106325
Question about Cardinality
9282
Prove using natural deduction $((P \land Q) \rightarrow R) \vdash (P \rightarrow R) \lor (Q\rightarrow R)$
79568
Cardinality of the set $D$
62687
Proving Cardinality of Cosets in Abstract Algebra
60722
Why does Cantor's diagonal argument not work for rational numbers?
1117
Is there a bijection between $(0,1)$ and $\mathbb{R}$ that preserves rationality?
98755
How can I show that the set of rational numbers with denominator a power of two form a dense subset of the reals?
2269
Proof that the real numbers are countable: Help with why this is wrong
38221
What is wrong with this proof there is no $\omega$-th worldly cardinal
34998
How to prove that $\mathbb{Q}$ ( the rationals) is a countable set
78287
Prove that if $n$ is not the square of a natural number, then $\sqrt{n}$ is irrational.
18527
Confusion on Derived Sets and the $n$-the Derived Set