Proof for how .9999999...=1
286
Is it true that $0.999999999\ldots=1$?
146867
Combinatorial Proof Of A Number Theory Theorem--Confusion
37603
Finding the Integer part of $\sum_{k=2} ^{9999}\frac{1}{\sqrt k}$
154133
Flawed proof by induction that $a^{n-1}=1$
4512
Is there a direct, elementary proof of $n = \sum_{k|n} \phi(k)$?
103545
Prove "casting out nines" of an integer is equivalent to that integer modulo 9
140155
Proving that a number with digits 1...9 in some order, ending in 5, is not a perfect square.
120309
Number Theory Inequality Proof
112237
prove this :$\sum_1^{100} A_i = \sum_0^{99} C_i $
27844
How do we prove that $\lfloor0.999\cdots\rfloor = \lfloor 1 \rfloor$?
127843
Prove that, for any natural number $k$ $\exists m \in M $ s.t i) $m$ has exactly $k$ $1$'s, an
158335
Why is this $0 = 1$ proof wrong?
31954
Why this proof $0=1$ is wrong?(breakfast joke)
135892
Understanding the proof for showing that there are infinitely many $n\in\mathbb{Z}^+$ such that $n!+1$ is divisible by at least two distinct primes
28541
How to prove the mathematical induction is true?
22397
Is 0.9999... equal to -1?
124917
Fibonacci numbers and proof by induction