User talk:Encyclops

Welcome!

Hello Encyclops, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay. Here are a few good links for newcomers:

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And one request. It is good to use edit summaries when you contribute. You've been doing that lately and that is much appreciated. Enjoy! Oleg Alexandrov (talk) 18:35, 31 December 2005 (UTC)[reply]

Notational and Usage Conventions

Hello. Your recent edits to log-normal distribution prompt two tips.

(1) Notice the difference between these:

({\frac {a}{b}})

\left({\frac {a}{b}}\right)

Allowing the parentheses to have the right size, as in the second case, is customary.

(2) "Partial expectation", with a lower-case initial "e", is correct Wikipedia style; capitalizing the "e" is not.

Michael Hardy 01:12, 2 January 2006 (UTC)[reply]

Invitation

Hi! You may be interested in following the discussions on the talk pages of Wikipedia:WikiProject Physics and Wikipedia:WikiProject Mathematics. If so, please think of putting yourself on the participants list for the projects as well. linas 03:52, 20 March 2006 (UTC)[reply]

People in systems and control

Hi, just wanted to compliment you on improving the People in systems and control article. Good job. Now the article makes more sense then when I first encountered it. Garion96 (talk) 01:42, 29 July 2006 (UTC)[reply]

Thank you! Encyclops 03:36, 29 July 2006 (UTC)[reply]

apologies

Hi. It seems I jumped the gun by tagging your article with the context template. I only realized later your "more to come" edit sumary. Feel free to remove it (although I still believe that it could have a bit more context!) Pascal.Tesson 19:36, 29 July 2006 (UTC)[reply]

Condensing bios

Good work on the bios in People in systems and control. Currently, the historical figures are presented as a dense list, and it would be nice to see the active researchers bios condensed as well. It seems odd/absurd to be so verbal about the current researchers when the historical figures where groundbreaking, and the active researchers "just" "wrote a few books". I feel it would be good to condense the bios. I will gladly do so, given the go ahead. The goal would be to have them down to 1 line of text in most browsers/resolutions, like the historical figures. Agree/Disagree? jugander (t) 17:34, 8 August 2006 (UTC)[reply]

OK. But I am worried about shortening it too much. It seems to me the word "professor" could be omitted in each case, but I would leave the name of the university, for example. In the beginning each person had literally just the name and it was difficult for the causal reader to have any idea who these people were and why they are mentioned. Ultimately though, I agree with you. Encyclops 17:51, 8 August 2006 (UTC)[reply]

Kolmogorov equations

Thanks of the clear up on those! jugander (t) 06:11, 15 August 2006 (UTC)[reply]

Hamiltonian

At the end of the article on Hamiltonian (control theory), you mention that in discrete time the costate variables have to be considered a timestep ahead of the state variables. It's not particularly clear why this is - could it be explained quickly, or referenced? Helmut Ahab 00:35, 7 September 2006 (UTC)[reply]

It is a notational convention, not a deep result. I have added a small explanation. Encyclops 00:25, 8 September 2006 (UTC)[reply]

Thanks for that. 128.250.102.134 00:49, 26 September 2006 (UTC)[reply]

Images listed for deletion

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Thank you. Pekaje 20:06, 19 April 2007 (UTC)[reply]

Statistical Arbitrage

In my humble opinion, Statistical arbitrage is more within the scope of something like WP:WikiProject Finance than WP:WikiProject Statistics. It is a topic in Finance (or Mathematical Finance) having some statistical aspects, rather than a mainstream Statistics topic. Encyclops (talk) 17:58, 22 April 2008 (UTC)[reply]

See Wikipedia talk:WikiProject Statistics#Things on boundary of scope. My thought was that Statistical arbitrage did involve some statistical thinking in setting up the method. At present WikiProject Statistics is trying to bring all articles on statistics topics into the list of statistical topics to provide a basis for further progress. You might want to look at the project page and consider joining. Melcombe (talk) 18:11, 22 April 2008 (UTC)[reply]

farkas

Yes of course it should - that was a typo by me - thanks for noticing! However on a sidenote the lemma seems to be stipulated very differently in different texts... I've learnt it by using the Ax = b and the transponate in the alternative which i think is more logical. The typo with the $\geq /\leq$ came up when i changed them around because i found one source also using convex analysis style markings for that, but i think normals are correct here though. But thanks for notcing that. Gillis (talk) 14:25, 14 September 2008 (UTC)[reply]

Thanks for StatArb article

Not reading JofF and rest of fin lit on a regular basis, would like to thank you for drawing attention to Khandani and Lo (2007) article. Clears up some latent questions. Any insider rumours on the particular strategy (CDOs?) that brought the Aug 2007 event? 212.188.109.216 (talk) 21:12, 9 December 2008 (UTC)[reply]

TeX issue

Hello. Your edits to Fenchel's duality theorem prompt this comment. Please notice this difference—in particular in the positions of the subscripts on "min" and "max":

\mathrm {min} _{x}(f(x)-g(x))=\mathrm {max} _{p}(g^{\star }(p)-f^{\star }(p)).\,

\min _{x}(f(x)-g(x))=\max _{p}(g^{\star }(p)-f^{\star }(p)).\,

The latter uses \min_x and \max_p rather than \mathrm{min}_x and \mathrm{max}_p and is standard usage. Using the standard operator names rather than \mathrm not only affects the position of the subscripts but also in some cases affects spacing between "min" or "max" and the things that precede and follow them. Also, I think when "min" or "max" appears in a subscript or superscript, the standard operator name is made to assume the appropriate sizes—that's built into the software. Michael Hardy (talk) 14:39, 8 February 2009 (UTC)[reply]

Wikipedia conventions

This edit goes against standard Wikipedia conventions and makes an exception of this one case. I've moved it back. Michael Hardy (talk) 14:44, 8 February 2009 (UTC)[reply]

Cramer's paradox

Hi, Encyclops, whoever you are. Since User:Charles Matthews hasn't bugged you on this it falls to me to do so. You've been sitting on your very nice piece about Cramer's paradox for ten months now, please elevate it to an article ASAP. --Vaughan Pratt (talk) 05:48, 1 May 2009 (UTC)[reply]

Desarguesian plane

Hi Encyclops -- you started out the Desarguesian plane article with "In finite geometry". In the meantime, it's been categorized under projective geometry, and your reference to non-Desarguesian finite geometries has been replaced by a reference to non-Desarguesian planes, with the example of the Moulton plane, which, if I understand the term correctly, is not a finite geometry. Am I right in concluding that the article should start out with "In projective geometry" instead? Joriki (talk) 11:39, 24 January 2011 (UTC)[reply]

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Proposed deletion of Dante C. Youla

The article Dante C. Youla has been proposed for deletion because under Wikipedia policy, all biographies of living persons created after March 18, 2010, must have at least one source that directly supports material in the article.

If you created the article, please don't take offense. Instead, consider improving the article. For help on inserting references, see Wikipedia:Referencing for beginners or ask at Wikipedia:Help desk. Once you have provided at least one reliable source, you may remove the {{prod blp}} tag. Please do not remove the tag unless the article is sourced. If you cannot provide such a source within ten days, the article may be deleted, but you can request that it be undeleted when you are ready to add one. Eeekster (talk) 00:52, 29 March 2011 (UTC)[reply]

Another Bellman winner

OK.

File permission problem with File:JuergenStark01.jpg

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Thanks for letting me know. Encyclops (talk) 17:14, 7 December 2011 (UTC)[reply]

Hello

it's me, Freddy! — Preceding unsigned comment added by 108.30.107.177 (talk) 22:11, 1 May 2014 (UTC)[reply]

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