Logical proof that .9999...=1
286
Is it true that $0.999999999\ldots=1$?
126015
Elementary number theory in sets
77200
Prove:that in any set of 1009 positive integers exits two numbers $a_i$ and $a_j$ such that $a_i-a_j$ or $a_i+a_j$ is divisible by 2014
115145
Show that $n-m$ is a multiple of 9 when $n$ and $m$ have same digits
108748
Why there are real numbers with infinite digits, but no such natural numbers (or another reason why real numbers are uncountable)
52416
The final number after $999$ operations.
67066
Proof there is a 1-1 correspondence between an uncountable set and itself minus a countable part of it
19018
Proving Pascal's identity
29692
Proof verification: elementary Number Theory Proof of $am+bn = 1$
42289
prove that there are infinitely many numbers of the form $x = 111....1$ such that $31\mid x$
49372
$x+1/x$ an integer implies $x^n+1/x^n$ an integer
424
Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$
95057
Possible fake proof of $1= -1$
100399
A doubt with a part of a certain proof.
66019
Revisited: Binomial Theorem: An Inductive Proof
30478
How to prove that a number is irrational
108698
proof using the mathematical induction