most recent 30 from http://mathoverflow.net 2013-05-25T06:48:48Z http://mathoverflow.net/feeds/user/11570 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://mathoverflow.net/questions/51056/are-there-any-good-websites-for-hosting-discussions-of-mathematical-papers maxdev 2011-01-03T20:14:46Z 2012-07-05T13:21:03Z

<p>I was wondering if there are any websites out there which </p> <ul> <li>systematically provide space for the discussion of mathematics articles (particularly those on the arXiv, though not necessarily just those), and </li> <li>have a large enough user base to have some hope of having a good discussion (or at least have hope of attracting one in the near future).</li> </ul> <p>Of course, MO is not so far from such a site, but is organized around questions, not papers, which leads to rather different discussion in practice. Similarly, some blog posts and nLab pages serve this purpose, but are not created systematically. </p>

http://mathoverflow.net/questions/51055/is-division-considered-the-mathematical-dual-of-multiplication/51058#51058 maxdev 2011-01-03T20:22:59Z 2011-01-03T20:22:59Z

<p>I think that non-technically, duality is pretty unrestricted (if the dual of A is B, then the dual of B is A). But if you use it technically, it is important to say exactly what you mean by it.</p>

http://mathoverflow.net/questions/50743/moore-penrose-pseudo-inverse/50771#50771 maxdev 2010-12-30T22:54:31Z 2010-12-30T22:54:31Z

<p>"what i am looking for is what is suppose I know the MP of Z^T Z, how can i get the MP of A Z^T Z A using A and the MP of Z^T Z? thanks"</p> <p>$(A Z^T Z A)^\dagger = (A ((Z^TZ)^\dagger)^\dagger A)^\dagger$</p>

http://mathoverflow.net/questions/50763/what-is-the-dimensionality-of-a-tree/50764#50764 maxdev 2010-12-30T21:42:23Z 2010-12-30T21:42:23Z

<p>There are treelike structures here with varying fractional dimensions.</p> <p><a href="http://en.wikipedia.org/wiki/List_of_fractals_by_Hausdorff_dimension" rel="nofollow">http://en.wikipedia.org/wiki/List_of_fractals_by_Hausdorff_dimension</a></p>

http://mathoverflow.net/questions/50760/order-statistics-probability-random-variable-is-k-th-out-of-n-when-ordered/50761#50761 maxdev 2010-12-30T21:21:30Z 2010-12-30T21:21:30Z

<p>stats.stackexchange</p>

http://mathoverflow.net/questions/49979/statistics-of-a-simple-markov-chain/50001#50001 maxdev 2010-12-20T21:46:04Z 2010-12-20T21:46:04Z

<p>By exponential moving average you mean something like $b_k = C \sum_{i=k}^{\infty} {\frac{a_i}{\lambda^i}}$ ? If $\lambda$ is small enough then this would depend hugely on $a_k$ and so it wouldn't be gaussian right?</p>

http://mathoverflow.net/questions/49984/technical-trends-quietly-aimed-at-big-open-problems/49991#49991 maxdev 2010-12-20T19:06:51Z 2010-12-20T19:06:51Z

<p>The study of L-functions is related to a few of the Millennium problems.</p>

http://mathoverflow.net/questions/49437/why-are-so-few-operations-with-arity-bigger-than-2/49449#49449 maxdev 2010-12-14T22:15:50Z 2010-12-14T22:15:50Z

<p>Is this like the question why matrices are more common than multi-matrices? Feel free to flag this as spam because I don't have enough mathoverflow bucks to comment.</p>

http://mathoverflow.net/questions/49425/calculate-largest-possible-standard-deviation-for-a-set/49427#49427 maxdev 2010-12-14T20:26:44Z 2010-12-14T20:26:44Z

<p>The sample deviation is maximized when half of the observations are at each extreme. If you want a formula for the maximum standard deviation as a function of the interval endpoints and the number of samples, you will probably want to divide the formula up depending on whether the number of samples is even or odd.</p>

http://mathoverflow.net/questions/51055/is-division-considered-the-mathematical-dual-of-multiplication/51058#51058 maxdev 2011-01-03T20:45:42Z 2011-01-03T20:45:42Z

sorry this wasn't supposed to be condescending

http://mathoverflow.net/questions/49984/technical-trends-quietly-aimed-at-big-open-problems/49991#49991 maxdev 2010-12-20T19:18:40Z 2010-12-20T19:18:40Z

I guess this is not really quiet or secret.

http://mathoverflow.net/questions/49425/calculate-largest-possible-standard-deviation-for-a-set/49427#49427 maxdev 2010-12-14T20:27:27Z 2010-12-14T20:27:27Z

There is also a stats stackexchange if I am not mistaken, where this question may be more appropriate.