User talk:Lunch

From Wikipedia, the free encyclopedia

You have new messages (last change).

Welcome!

Hello Lunch, 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:

I hope you enjoy editing here and being a Wikipedian! Please sign your name on talk pages using four tildes (~~~~); this will automatically produce your name and the date. If you have any questions, check out Wikipedia:Where to ask a question or ask me on my talk page. Again, welcome! 

Thank you for your fix at Fréchet derivative. Oleg Alexandrov (talk) 00:12, 23 December 2005 (UTC)

Contents

[edit] Jaybird-Woodpecker War

--When you deleted the information from the jaybird-woodpecker article did you do so because you had information proving that the "half-crazy" man was not named Bob Chapel and also not a negro, or did you delete it because you found the content objectionable? The first is acceptable, the second isn't. If you would prefer a different euphemism, please change the wording, but don't remove relevant facts from an article. The entire jaybird-woodpecker incident is based on post reconstruction racial tension, so I believe Bob Chapel's race is valuable data. Removing that fact obscures the truth. If you have more information please add to the article instead of deleting content.

(the above comment is from User:Meekrob)

i started a talk page for the jaybird-woodpecker war. i didn't find the reference to bob chapel objectionable; i thought it was irrelevant. it seemed like a bit of trivia that made the article folksy, but didn't belong in an encyclopedia article. maybe it belongs in an article about bob chapel, but not here - not until the article becomes more substantive and that bit isn't representing information about the war so disproportionally.

NB: i also added to the article.

Lunch 02:06, 16 March 2006 (UTC)


[edit] Notes to self

Make a page for "Holder space" that redirects to "Holder condition". Correct Holder condition to note that alpha (maybe make it gamma) should be less than or equal to 1. Equal to 1 is noted as Lipshitz; equal to 0 should be noted as bounded. See def'ns in Evans sec5.1, pp240-241. Holder class could be added too.

More general statement of the Sobolev inequalities is on p270 of Evans (and C^1 could be Lipshitz). What reference has it for unbounded domains? And a statement of continuous embedding? Brenner and Scott also have a partial statement at the end of Chapter 0. (And do they change W^k_p to W^{k,p} in the second edition?)

Add Evans reference and others to Sobolev article. Does Sobolev inequality (in addtion to Sobolev embedding) redirect to that page? Comment on L^p vs. L_p; little l_p; W^{k,p} and notation common in FE texts. Weak derivatives formulation for integer k. More general statement of Sobolev embedding. *And the other half of the Sobolev embedding that says something about continuity.* Difficulties with p=1 and p=Infinity. Dual spaces. Definintion of H^k_0 (and H^{1/2}_{00} for trace spaces). More general extension and trace theorems.

add material from evans appendix to higher D section of Integration by parts. case where \mathbf{v}=\nabla v. look up the comment about integration by parts and distributions from old versions (referred to by CSTAR at the top of the discussion). make a comment about bilinear forms, symmetry, and regularity.

requested articles to make: Adaptive Simpson's method, preconditioner (with preconditioning redirecting to it), nested dissection algorithm, FEM (with Galerkin's method and the variational method), Kelvin's circulation theorem (referenced from Helmholtz's theorem and Vorticity). also:

on RK page, discuss IRK methods. new page for RKF methods (2/3 and 4/5 common). update Stiff_equation page; ref hairer and wanner, volume 2. see also Matlab documentation (/lusr/matlab/toolbox/matlab/funfun too) and Mathematica documentation.

improve the eigenvector/eigenvalue article

in calculus of variations article, put back historical information about brachistochrone curve (and others) motivating the development of variational calculus

make the M-matrix article. notes from saad and berman/plemmons. also, guermond notes that the positivity of the inverse of an M-matrix implies a discrete maximum principle. (and update Wikipedia:WikiProject_Mathematics/PlanetMath_Exchange/15-XX_Linear_and_multilinear_algebra;_matrix_theory)

[edit] The kadomtsev-petviashvili equation

I responded to your question on the help desk. I hope it helps. — ApolloCreed (comment) (talk) 02:55, 24 February 2006 (UTC)

Thanks for creating Kadomtsev-Petviashvili equation. I was wondering how we were going to get that one. Charles Matthews 16:10, 1 March 2006 (UTC)
Yes, thanks. Charles should have invited you to join in the conversations on the talk pages of Wikipedia:WikiProject Mathematics and Wikipedia:WikiProject Physics, where topics of general interest get announced and discussed. linas 15:13, 14 March 2006 (UTC)

[edit] Mesquite

mesquite is a phreatophyte (tap root into or near water table), but doesn't lose nearly as much water to evapotranspiration as salt cedar. additionally, "saltcedar is a facultative phreatophyte that can survive on soil water alone in the summer, whereas willows and cottonwoods are obligate phreatophytes that cannot lose contact with groundwater." from [1], but doesn't say if mesquite is a facultative phreatophyte as well.

the state of texas has brush mgmt programs to control salt cedar as well as mesquite. some river authorities have done feasibility studies on mesquite removal (among other plants as well). LCRA is notably absent from such lists of studies.

[edit] Diagonally dominant matrix

Thanks for creating the page on diagonally dominant matrix, and also a warm welcome from me. I see you have found the "Numerical linear algebra" category. I think the article is too long to be labelled a stub. I hope you will some time improve the page on RK methods as you outline above; I doubt I will find any time for it before I retire. And of course, feel free to ask me on my talk page if you have any questions. Cheers, Jitse Niesen (talk) 06:07, 24 May 2006 (UTC)

thanks for your fixes! (oops - there were some typos there, huh<blush>) Lunch 18:28, 24 May 2006 (UTC)

[edit] Pesky Mesquite

Regarding my edit on the mesquite article, you inquired about this sentence:

"In many parts of Texas, particularly West and Central Texas, the proliferation of mesquite is responsible for part of the lowering of groundwater tables, reputedly causing even more lowering in some places than that resulting from human over-pumping."

I don't believe it either, although I can see that any plant would be a compeditor for surface water. So out of disbelief I stuck in 'reputedly'. But I don't have a source for it, I can't in good concience do anything but whittle at it, to try to make it look less dire. Tom Lougheed 01:47, 24 June 2006 (UTC)

Thanks. I added a tag requesting a reference. If it doesn't change in a week, I'll remove it from the article and just leave it on the talk page. Lunch 03:53, 24 June 2006 (UTC)

[edit] Geostatistics

How would you like to help with this article? Ive been discussing this with JanWMerks on the talk page of the article, it seems that he is concerned with the variance of inverse distance weighted interpolation. Does his argument have any merit? I have read a number of articles on geostatistical analysis, they seem to follow statistical rules. However JanWMerks seems unable to elaborate on this beyond the few POV statements that he likes to repeat. I would like to include the seperate interpolation methods included in geostats, link this with the mathematical and statistical basis of the discipline, and describe its diversion from statistical analysis if there is one. I think that a math major (you), and a geography major (me), could make this a readable article. SCmurky 23:27, 24 June 2006 (UTC)

I'd like to get involved, but I don't have the time right now to edit it properly (or fight an ongoing war with a crank). Sorry. You might try asking all the people who have made comments on User_talk:JanWMerks. You could also look through his article edits to see what other articles he's been going at. Doubtless he has annoyed editors of other articles. You might try contacting them too. Best of luck. Lunch 19:49, 25 June 2006 (UTC)
Yeah theres a few others on his talk page, I think that they are all at the same point you are. Im just looking for someone who can state definatively that his arguments are unfounded. My understanding of statistics is limited (will get better), and I want to know whether his argument has merit. If you run into anyone who might know this, or a page which could use a geostats link... SCmurky 04:53, 27 June 2006 (UTC)


[edit] Rodney Reed

Hey thanks for the message. Since there is 5 links to wikipedia in the page I thought there is no point to mention that the article is from Wikipedia. However I will add it. Yea the one that you made was better than other profiles that I found in google. My friend is going to review it and edit or change something in there. I will update the wikipedia one later on. Let me know if you are interested to help me on the website for Rodney or other death row inmates. Hooman

This is the first time I'm using user talk thing. SO I'm not sure if I'm in the right place

Yup, right place. :) The usual thing is to reply where the message was posted so I'll write here, but I'll also CC to your talk page. Incidentally, you can sign your name with with tildes, ~~~, or your name with the date and time with four tildes, ~~~~.
Huh. I hadn't noticed the links to the Wikipedia on freerodneyreed.org. That's cool. But I think it'd be appropriate to have an explicit note that the page itself was borrowed from Wikipedia.
I added a wikilink to Texas Students Against the Death Penalty to the article on Mr. Reed.
I was interested in seeing the trial transcripts and crime scene photographs and other evidence entered at trial along with evidence that Mr. Reed's defense have accumulated afterword. I'd be willing to scan anything and everything and post it on the web; I have access to a vast amount of storage.
Cheers. Lunch 15:15, 8 August 2006 (UTC)

[edit] typesetting conventions

Wrong:

\int \int exp(-x^2-y^2)\,dxdy=\int exp(-x^2)\,dx \int exp(-y^2)\,dy,

Right:

\int \int \exp(-x^2-y^2)\,dx\,dy=\int \exp(-x^2)\,dx \int \exp(-y^2)\,dy,

In the second display, (1) the comma is INSIDE the math tags; on Wikipedia this prevents misalignment (although when TeX is used in the normal way rather than the way it's used on Wikipedia, this might not make any difference); (2) \exp rather than exp ; this not only prevents italicization but provides proper spacing; (3) \, between dx and dy. Michael Hardy 00:40, 10 September 2006 (UTC)

jeeez. the formula above was a quickie on a talk page to help someone figure out a formula they had trouble with. and if you have a beef with the way the Holder condition page was laid out, please note that i didn't write most of that page; i just added one sentence. Lunch 16:31, 10 September 2006 (UTC)
i also have a comment regarding point #1 above about the trailing comma. there is a sematic argument for putting the comma OUTSIDE the tag: the comma is NOT part of the formula. in TeX, the display style doesn't allow you to put trailing punctuation after an equation (it annoyingly puts it on the next line) so every user develops the habit of putting punctuation in formulas (rightly so). but this changes the meaning of the punctuation; it makes the punctuation part of the formula (which it's not). Lunch 18:24, 10 September 2006 (UTC)

[edit] Functional analysis and derivative operator

Hi, thanks for your edit. But my doubts were not about the linearity of the derivative operator, but the continuity of the derivative operator.Rich 06:38, 26 September 2006 (UTC)

Ah, OK. It's a little subtle. If you look at the definition of a Frechet derivative, it presumes not only that the derivative at a point is a linear map, but a bounded linear map. There is a theorem that boundedness of a linear map is equivalent to continuity. This is usually proved as an exercise in a first-year graduate class in analysis; it should be in any of a number of references. I can try and find one if you want. Cheers, Lunch 18:16, 26 September 2006 (UTC)
Even better, check the article "Bounded linear operator". It's got the proof of equivalence. Lunch 18:24, 26 September 2006 (UTC)

[edit] basis function

Thanks for taking the bull by the horns and fixing the lead sentence in basis function. I changed analysis to numerical analysis and tried to justify the change at Talk:Basis function. --Jtir 13:07, 26 September 2006 (UTC)

Okey doke. Sounds good to me. Unfortunately, it still needs a lot of work.  :( Even though my changes left the article in ugly shape, I hope at least it got right to the point and said what a "basis function" was. Sigh. So much work to do... Thanks for bringing attention to the article. Lunch 18:21, 26 September 2006 (UTC)
NP. We can thank User:Mct mht who first noticed the problem with the functional analysis cat. --Jtir 23:03, 26 September 2006 (UTC)
just to clarify a little bit. what i meant was that the presentation and content wasn't suitable for cat:functional analysis, not so much the title of article. the version i referred apprarently was talking about a Hilbert space basis for L^2. but nowhere was it mentioned that, for example, the basis is defined such that its linear span is only required to be dense. or that convergence is meant in the sense of L^2 and its relationship with convergence a.e. Mct mht 04:35, 27 September 2006 (UTC)
Lunch: i thought i was adding above comments to talk:basis function. oops. :-) Mct mht 04:40, 27 September 2006 (UTC)

[edit] specie vs. species

Thanks for your link on Asclepias asperula. However, note that the term is "species" (singular) and not "specie". (See, for example, the disambiguation page for specie.) I corrected it in this article, but if you've made the same link in other articles, you may want to go back and correct them yourself. Cheers, Lunch 21:34, 26 September 2006 (UTC)

Yes, I shall correct the same for terms beginning with A & B. Thank you for poinint out. It is really nice to see that someone always watches. I shall correct them immediately. This is the spirit of wikipedia. Regards. --Bhadani 21:37, 26 September 2006 (UTC)

[edit] RfD

I replied at Wikipedia:Redirects for discussion/Log/2006 September 26. I struck my "vote" since I'm no longer confident about the best action. Sorry for taking such a long time, but I'm working through a backlog and additionally hardware problems are bothering me. -- Jitse Niesen (talk) 02:02, 5 October 2006 (UTC)

No worries. Take your time. I get the feeling RfDs don't move too fast anyway. (And thanks for your interest, btw.) Lunch 03:06, 5 October 2006 (UTC)

[edit] HCSSiM

Lunch: Thanks for your frequent edits to Hampshire College Summer Studies in Mathematics. It's an article that should continue to grow. You may have seen that we lost Yellow Pigs Day to deletion review a few weeks back; I commented a sentimental keep although I can't really quarrel with the decision, but maybe we could get the page back at least as a redirect and add some of the content to the HCSSiM article. Regards, Newyorkbrad 02:32, 6 October 2006 (UTC)

Yeah, I didn't notice that it was up for deletion until after it was deleted. I even missed the deletion review.  :( The page itself has actually been preserved at User:Samir (The Scope)/Yellow Pigs Day.
The original AfD has some useful information, and so does the deletion review. Cheers, Lunch 03:42, 6 October 2006 (UTC)

[edit] Re:Template redirects

Hi - I can't rcall exactly where the debates were, but if you look in the archives of WP:WSS, WP:SFD, and various other places like that you're bound to find them. As for why they're a problem, basically when an article redirect is called up it calls up the redirect once and the page once. IIRC, for some reason with templates, it seems to be that the redirect is called up once and the template is then for some reason called up once for every time it is used. if a template is used on 25 articles, using a redirect causes 25 times more strain on the servers than using the template. Which is why redirects are rarely used with templates and avoided where possble (some cleanup editors actually go round replacing appearances of template redirects use with the templates themselves). Given how much stub templates are used, it makes sense not to use them if possible. Grutness...wha? 23:33, 21 October 2006 (UTC)

Thanks. The "authoritative" discussion seems to be at User_talk:Jamesday#Template_redirects. If all templates were redirects, it would double the amount of work the server would be doing when loading a page with those templates. It seems it currently affects about 1% of server load whose elimination (as small as it sounds) would be a significant relief. Cheers, Lunch 01:55, 22 October 2006 (UTC)

[edit] proof presuposes existance of a eigenvalue decomposition

In Projection (linear algebra) I used a proof that you correctly identified as presuposing the existance of a eigenvalue decomposition. What do you think of the new proof. Pdbailey 01:18, 27 October 2006 (UTC)

[edit] Nowikis

Thanks, in future I'll only be looking at pages where the template is invoked so less likely to be a problem, but I will test to see if theres a bug, or just a timeing or other mistake by me. Rich Farmbrough, 22:52 1 December 2006 (GMT).

Retrieved from "http://en.wikipedia.org../../../l/u/n/User_talk%7ELunch_a5c2.html"