Proof that the set of Natural numbers are equal to the Real numbers
2269
Proof that the real numbers are countable: Help with why this is wrong
88628
Proving the total number of subsets of S is equal to $2^n$
108698
proof using the mathematical induction
48797
Proving Two Sets are Equal - Infinite Sets - Example
126633
Is a contradiction enough to prove a set equality to $\varnothing$?
69875
Prove the commutativity property of addition of natural numbers by induction
153969
The "elements" of a real number
42603
How can I prove that the cadinality of a set minus a finite number of elements of it is still the same as the original set?
157733
Are positive real numbers $x,y$ allowed to be taken out during this proof?
75685
Prove that there is prime number and natural so $n\times q$ digits are $1$.
108922
Cardinality and infinite sets: naturals, integers, rationals, bijections
1318
What is wrong with this proof that the power set of the natural numbers is countable?
13656
Prove existence of a real root.
36694
Sum of first n natural numbers proof
53399
Proof of the uncountability of reals using the diagonal argument—problem?
63183
Suppose $a,b,m,n$ are natural numbers, prove that if $a({m \over n})=b$ and $(a,n)=1$, then ${m \over n} \in \mathbb{N}$
52682
Is the power set of the natural numbers countable?