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seen Oct 3 at 13:23

Jan
4
awarded  Pundit
Jan
4
comment ordering 3 couples in 3 rows
Is it three friends or six?
Dec
30
comment Bijection from ordered pairs of $[0,n]$
What's wrong with the Cantor pairing function? The bijection is infinite.
Dec
30
comment How to find coefficient of $x^8$ in $\frac{1}{(x+3)(x-2)^2}$
I think the OP wants a rational, not a floating point number.
Dec
26
comment General form for the series expansion of $e$
Does this mean that $$\sum_{n=1}^{\infty} \frac{n^k}{n!} = e \cdot B(k)$$ where B(k) is the number of set partitions of $k$?
Dec
26
revised Dealing with Generating Functions accurately
extra explanation
Dec
25
answered Dealing with Generating Functions accurately
Dec
24
comment How to list graphs systematically?
I think your restriction to 'not isomorphic graphs accidentally' is somehow just not possible. You may possibly mean not using particular machinery like group-theoretic counting arguments (Polya counting) but that is a different thing.
Dec
16
awarded  Nice Answer
Dec
7
comment comparison of simplex and shortest path method
@PeterSheldrick: I didn't follow the last run time mentioned $O(n^2 + n m)$, where it comes from (but it is obviously slower than Dijkstra's for a connected graph).
Dec
7
revised comparison of simplex and shortest path method
grammar
Dec
7
answered comparison of simplex and shortest path method
Dec
7
revised Are all good mathematicians fluent in computational aspects of mathematics
grammar
Dec
3
comment How to prove that either $2^{500} + 15$ or $2^{500} + 16$ isn't a perfect square?
Dude, you just gave him a fish. He'll die of starvation tomorrow.
Nov
23
revised Translating an argument into symbolic logic
fixed logical error
Nov
22
comment Translating an argument into symbolic logic
@Adam: Argh...I don't know what I was thinking. I meant absorption...fixing now.
Nov
11
awarded  Nice Answer
Nov
9
comment Show that $\frac{(2n)!}{(n)!}=2^n(2n-1)!!$
@Pauly...if you call 'helping' = 'doing the entire problem for you'
Oct
25
awarded  Popular Question
Oct
21
comment Are there any open mathematical puzzles?
I was about to remark that this is genref because of the many lists of unsolved problems in mathematics. But then I noticed that the title specifically says 'puzzles'. But then I'm not sure what the difference is between 'puzzles' and mathematical problems in general. I mean I know it when I see it but...