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revised wanted to edit answer, but was not allowed to do so
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comment How to prove $\sum\limits_{i=1}^{\infty}\dfrac{i}{2^i}$ converges?
Here is another question about the same series: math.stackexchange.com/questions/441481/…. And here is a generalization math.stackexchange.com/questions/30732/….
5h
comment How to prove $\sum\limits_{i=1}^{\infty}\dfrac{i}{2^i}$ converges?
Since your answer uses limit of $\sqrt[n]n$, I thought that it might be useful to add links to some posts about this limit: math.stackexchange.com/questions/28348/…, math.stackexchange.com/questions/115822/…
5h
comment How to prove $\sum\limits_{i=1}^{\infty}\dfrac{i}{2^i}$ converges?
Partial sums are calculated in this question: math.stackexchange.com/questions/129302/… However, showing that a series converges is an easier task than finding its sum.
8h
revised Shortest and most elementary proof that the product of an $n$-column and an $n$-row has determinant $0$
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8h
revised Determinants, how do they emerge and why?
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8h
revised GRE textbooks question - calculus and linear algebra
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revised Multivariable Calculus for GRE
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revised Books to study for Math GRE, self-study, have some time.
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8h
revised I have one month preparation. Please suggest some books.
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8h
comment Are Questions Actually Being Merged?
The difficulty with merging (as I see it) is that if two questions are duplicates, but use different notation, then answers to one of them would not make sense as answers for the other question. (Imagine, for example, seeing an answer which exchanges all $n$ and $k$'s. Especially if the answer does not repeat the claim from the question with new variables, but simply states some short hint. I think that something like that might be confusing.)
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revised Are Questions Actually Being Merged?
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revised Is $\mathbf{Rel}$ pre-additive?
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20h
comment Naming of an [ordered-groups] tag
There is also a possibility to create two tags and make them synonyms.
23h
comment Reputation gained from an accepted answer and an upvote.
In one of the answers here it is said that reputation recalc on an account can be triggerd by a ♦moderator.
23h
comment How do you calculate this limit $\lim_{n\to\infty}\sum_{k=1}^{n} \frac{k}{n^2+k^2}$?
I apologize - it is not the same question, only similar.
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comment Show that there exists $\xi\in [a,b]: f(\xi)=\xi$.
You probably wanted to write $g(z)=0$ and $g(\xi)=0$ (instead of h).
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revised Show that there exists $\xi\in [a,b]: f(\xi)=\xi$.
edited body; edited tags
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comment How to decide if an advisor should be considered as a co-author of a paper or not?
Related: When should a supervisor be a co-author? at MathOverflow.
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comment Reputation gained from an accepted answer and an upvote.
I have had a look at this post: How do I audit my reputation?. Among other things it mentions that: repuatation recalc is performed automatically. But I do not know under what circumstances or how often it the recalc is started.
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