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May
27
comment Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$
Is there a typo in the second equation (first sum)? I believe $k$ should be indexed.
May
26
comment Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent
yeah, I got the same thing, but I just didn't express the final step like that. Does it matter though?
May
26
accepted Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent
May
26
comment Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent
$z > 1-\bar{z}$?
May
26
revised Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent
edited tags
May
26
asked Finding the values of $z$ s.t. $\sum_{n=0}^{\infty} \left( \frac{z}{1+z} \right)^n$ is convergent
May
22
asked Proving $\sum_{m=0}^M \binom{m+k}{k} = \binom{k+M+1}{k+1}$
May
19
awarded  Constituent
May
19
asked Proving that $X$ is a subgroup of $G$
May
19
accepted Definition of open set/metric space
May
18
asked Definition of open set/metric space
May
17
comment Are there any series whose convergence is unknown?
Out of curiosity, what makes this a "joke" answer?
May
15
accepted Finding asymptotes to general functions
May
15
asked Finding asymptotes to general functions
May
14
comment Finding asymptotes of exponential function and one-sided limit
@Mhenni Why are the first two terms of the taylor series expansion enough to find the asymptote? Certainly there are functions where the first two terms wouldn't suffice to give an accurate approximation.
May
14
comment What are the limits and asymptotes of $f(x)=x+\frac{1}{x}$?
@Garmen1778 I'm not sure if you were implying that there was a horizontal asymptote or not, but in case there's any ambiguity, there are no horizontal asymptotes.
May
14
accepted Infinitely many primes of the form $4n+3$
May
14
revised Infinitely many primes of the form $4n+3$
deleted 2 characters in body
May
14
asked Infinitely many primes of the form $4n+3$
May
14
answered If the sum of positive integers $a$ and $b$ is a prime, their gcd is $1$. Proof?