$.9999\dots = 1 $ What's wrong with this Algebra?
286
Is it true that $0.999999999\ldots=1$?
5679
Why is $2\pi i \neq 0?$
33737
Does $1.0000000000\cdots 1$ with an infinite number of $0$ in it exist?
143620
How many $n$-digit decimal sequences (using the digits $0 = 9$) are there in which the digits $1$, $2$ and $3$ all appear?
45911
Prove that none of $\{11, 111, 1111,\dots \}$ is the perfect square of an integer
71604
Why is the determinant of the 0x0 matrix equal 1?
124136
Why does the division algorithm work for converting between number bases?
17211
Is it wrong to tell children that $1/0 =$ NaN is incorrect, and should be $∞$?
40837
Why $e^{i(π/3)} \ne -1$?
56745
Why does this not work with an imaginary exponent?
31244
Is this a correct bijection between $(0,1]$ and $[0,1]$?
119815
Why is $\tan((1/2)\pi)$ undefined?
131112
Why pow(10,5) = 9,999 in C++
111938
How do I find a flaw in this false proof that $7n = 0$ for all natural numbers?
9343
Why does $\frac{1 }{ 99989999}$ generate the Fibonacci sequence?
22397
Is 0.9999... equal to -1?
2932
How do I prove this sum is not an integer