What is wrong with my proof showing the real numbers between 0<=x<1 are countable?
2269
Proof that the real numbers are countable: Help with why this is wrong
157733
Are positive real numbers $x,y$ allowed to be taken out during this proof?
136538
How can I show that a bijection between $[0,1)$ and $(0,1)$ cannot be continuous?
121085
Showing that $\lim\limits_{x \rightarrow 0} \frac{1}{x}$ does not exist.
88904
Help with a proof. Countable sets.
121161
Let S be the set of all real numbers in the interval (0; 1) whose decimal expansions contain only 0's, 4's and 8's. Prove that S is uncountable.
51094
Prove that the set of integer coefficients polynomials is countable
144633
Verification of proof involving logarithms and limits
122076
A one line proof that one is zero using Mathematica 10
89535
fake proof of $\forall a. \forall b. a = b \to 1 = 0$
157513
How can I prove that these sets are countable infinite?
57215
Stuck on formal proofs. Not sure how to continue
22232
Proving that cardinality of the reals = cardinality of $[0,1]$
68430
Proving the countability of algebraic numbers
122762
Proving that the limit doesn't exist for $x$ other than $0$
46967
What is wrong with this proof that the power set of natural numbers is countable?
116009
Proving that if a set is both open and closed then it is equal to the real numbers