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| bio | website | |
|---|---|---|
| location | Berlin, Germany | |
| age | 43 | |
| visits | member for | 2 years, 3 months |
| seen | 1 min ago | |
| stats | profile views | 12,490 |
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1h |
comment |
exponential generating functions containing an even/odd number of cycles @Marc: You're right of course :-) Corrected. |
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1h |
revised |
exponential generating functions containing an even/odd number of cycles correction |
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1h |
answered | exponential generating functions containing an even/odd number of cycles |
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2h |
comment |
Expansion vs Sparsest cut For displayed equations, you need to include the punctuation within the equation (preferably offset by a \; space); otherwise it ends up on the following line, as you can see in your last equation. |
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2h |
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Intersection of intervals The $\TeX$ command for the empty set $\emptyset$ is \emptyset. |
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2h |
revised |
The existence of a graph homomorphism typo |
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2h |
answered | Representation Theory. Why does $a^{r}b^{s}a^{t}b^{u} = a^{i}b^{j}$? |
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3h |
comment |
Representation Theory. Why does $a^{r}b^{s}a^{t}b^{u} = a^{i}b^{j}$? If you upload entire pages of books, it seems appropriate to specify the source. |
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3h |
answered | The existence of a graph homomorphism |
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3h |
comment |
The existence of a graph homomorphism The preposition "between" seems a bit confusing here -- an isomorphism is "between"; a homomorphism has a direction, which is more usually expressed by "from ... to". |
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9h |
comment |
Volume of a set in phase space. How many dimensions? Then you should update the question. It's confusing to have two different versions in the question and the comments, and peope shouldn't have to read through the comments to understand the question. |
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17h |
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Generating function question about arranging n objects with limitations Your chances of getting a useful answer are much higher if you interact with comments. |
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21h |
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Square matrix $\|Ax-Ay\|\le \|x-y\|$ @Sandy: Ah, now I see what $0,7$ and $0,5$ was about. $\TeX$ is anglo-centric; it interprets periods as decimal periods and commas as punctuation, not as decimal commas, so you get bad spacing when you try to use the comma as a decimal comma. I see now that you meant $0.7$ and $0.5$. Yes, you can use those values. |
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21h |
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Square matrix $\|Ax-Ay\|\le \|x-y\|$ @Sandy: Yes, that's correct, though I'm not sure why you added $n=2,3$; those inequalities hold for general $n$. |
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22h |
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Square matrix $\|Ax-Ay\|\le \|x-y\|$ @Sandy: We seem to be talking past each other. I don't understand what you mean by "taking $0,7$". What I mean by a matrix with constant entries $c$ is the matrix $$ \pmatrix{c&c\\c&c}\;. $$ |
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22h |
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Rolling dices and simple problem Sorry, that seems to be a misunderstanding. I wasn't saying that it matters which number on the dice you're waiting for. I was saying that it makes no sense to ask for the time it takes until you get that number on all dice, because that time will be different every time you do the experiment. A more meaningful question is what the expected value, that is, the average, of the required time is, and your last paragraph seems to suggest that this is what you in fact intended to ask about in the preceding paragraphs. |
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22h |
revised |
Generalized nontransitive dice slightly more precise |
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22h |
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Rolling dices and simple problem The question has no well-defined answer in its present form, since the time it takes will obviously be different on different trials. In case you intended to ask about the expected value of the time it takes, this question has been asked before here but I couldn't find the duplicate. |
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22h |
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Square matrix $\|Ax-Ay\|\le \|x-y\|$ @Sandy: I'm not sure I understand the question. I wrote that it's a matrix with constant entries; that doesn't leave anything to construct. All you need is the constant value $c$ of the entries, and you can get the admissible interval for that by requiring that $\lVert Ae_i\rVert=c\sqrt n\le1$ and $\lVert Az\rVert/\lVert z\rVert=cn\gt1$. |
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22h |
revised |
Generalized nontransitive dice added note about question 3 |
