User talk:Mct mht

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Mct mht ("This is my haus, nigga, my haus!" -Yao Ming to Rasho Nesterović )14:12, 26 August 2006 (UTC)

I am also 24.155.72.152 (talk) on a few of the math pages. Mct mht 01:50, 5 April 2006 (UTC)

Welcome!

Hello, Mct mht, 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 need help, check out Wikipedia:Questions, ask me on my talk page, or place {{helpme}} on your talk page and someone will show up shortly to answer your questions. Again, welcome! Oleg Alexandrov (talk) 23:16, 2 April 2006 (UTC)

1 Math
2 Physics

[edit] Math

[edit] Real-valued assumption in convergence theorems

You are removing the assumption that some measurable functions have real values from a lot of places. But then you can't talk about almost everywhere convergence, you need values at least in a metric space.

Do you have references when those theorems hold? I suggeest you go back to the real number-valued functions, and that's the classical case, and it is surely correct. Thanks, and you can reply here. Oleg Alexandrov (talk) 15:10, 12 April 2006 (UTC)

Yeah, in fact it is kind of weird that the previous contributors imposed the real-valued assumption. Surely something like the dominated convergence theorem, Egorov's, and Lusin's don't need that assumption. Should be in any reasonably modern introductory text on real analysis. Mct mht 19:22, 12 April 2006 (UTC)

Oleg, maybe I misunderstood your point. What I meant is the standard assumption, in this context, is that they're complex valued. Mct mht 19:26, 12 April 2006 (UTC)

But there is no "standard" assumption. A measurable function can theoretically take values in any measure space, as long as the inverse of a measurable set is measurable.

By the way, going to complex-valued function doesn't add much value in terms of generality, so I'd say we stick with real-valued functions. Most measure theory is done with such functions anyway. Oleg Alexandrov (talk) 23:09, 12 April 2006 (UTC)

In any case, considering metric spaces of metric-space valued functions on a measure space (X, M, μ) with an (extended) metric

$d_p(f,g) = \bigg\{\int_X d(f(x),g(x))^p d \mu(x)\bigg\}^{1/p}$

is a bit of overkill for an encyclopedia article.--CSTAR 01:46, 20 April 2006 (UTC)

A side note, apparently there are Lusin type results for Bochner integrals. Didn't know that. Mct mht

[edit] Square root of a matrix

Hi. It seems you're still working on square root of a matrix, so I won't edit that page myself at the moment. However, could you please bear in mind that the phrase "positive matrix" is often used to describe a matrix with positive entries? I gather that you're talking about a positive-definite matrix. Great work, by the way. Cheers, Jitse Niesen (talk) 10:01, 17 August 2006 (UTC)

i just finished with that page. i appreciate the courtesy. re usage of positivity: maybe add a disclaimer somewhere? Mct mht 10:04, 17 August 2006 (UTC)

Yes, that's fine. I also came across this edit which I don't understand: "a bounded operator on a complex Hilbert space is necessarily Hermitian, or self adjoint". Should there be an extra condition somewhere? Multiplication by i is not Hermitian, is it? -- Jitse Niesen (talk) 10:12, 17 August 2006 (UTC)

not quite sure what you mean by mutiplication by i, Jitse. i think that edit is correct, no extra condition needed. for complex Hilbert spaces, if we have <x, Mx> ≥ 0 for all x, the polarization identity shows <x, My> = <Mx, y> for for x and y, so M is self adjoint. Mct mht 10:19, 17 August 2006 (UTC)

With "multiplication by i", I mean the operator which maps x to ix, where i is the square root of −1.

I think that instead of "a bounded operator on a complex Hilbert space is necessarily Hermitian, or self adjoint", you mean "a bounded operator M on a complex Hilbert space for which Re <x, Mx> ≥ 0 for all x, is necessarily Hermitian, or self adjoint"; that's the extra condition I'm talking about. -- Jitse Niesen (talk) 10:53, 17 August 2006 (UTC)

damn, is that what i typed? lol, very sry, Jitse, saw it just now. it should be "a bounded positive operator on a complex Hilbert space is necessarily Hermitian, or self adjoint." Mct mht 11:08, 17 August 2006 (UTC)

[edit] Resolvent formalism

Hi,

Back in August, you removed some text from resolvent formalism, and I don't understand why. Could you take a look at the talk page? linas 03:49, 27 October 2006 (UTC)

hey, linas. i gave a reply there. Mct mht 04:00, 27 October 2006 (UTC)

[edit] Physics

[edit] Quantum operations

I can't hep but notice you are interested in them. You might find the current discussion here Talk:Many-worlds interpretation interesting.--CSTAR 17:16, 15 May 2006 (UTC)

CSTAR: Heh. Much thanks for bringing this to my attention. Will go have a listen there. Mct mht 17:39, 15 May 2006 (UTC)

[edit] Canonical Ensemble

Why do you consider treating the heat bath as made up of a large number of loosely-couple copies of the main system is incorrect? (It enables you to then the results from the MCI for a large number of coupled discrete systems with a prescribed total energy.) Linuxlad 16:13, 19 May 2006 (UTC)

if you put it that way, then yes fine. if a comment to that effect is to be added, should be phrased like that as well in the article, not as it previously was. Mct mht 16:17, 19 May 2006 (UTC)

i assume by MCI you mean MCE. Mct mht 16:22, 19 May 2006 (UTC)

Yep - (I thought I wasn't misremembering my old lecture notes even though they are now rather old!) I'll see if I can reinstate the point more to your liking...Bob aka Linuxlad 16:30, 19 May 2006 (UTC)

[edit] Your AfD re Derivation of the partition function

I apologize if my quick and harsh responses have felt like I was biting you, but deletion is a serious matter. However, I advise you to refrain from commenting on other editors' intelligence as you did, which is at the least uncivil and at worst a personal attack. In fact, I advise you to stop commenting so much in the AfD in general: you really haven't added anything new to the discussion since your nomination, and you should let the community speak. As you are a newcomer, though, let me direct you to Wikipedia:Introduction to Deletion Process, where you can learn about how deletion works and what the processes are, and where to read more, as well as Wikipedia:Moving and merging, where you can learn about how to deal with redundant or badly named articles. And if this is a question of not being sure you could edit out parts of an article by yourself, wikipedia encourages you to be bold. Mango juice^talk 18:06, 22 May 2006 (UTC)

i thought the discussion was over as far as i was concerned, and i wasn't going to comment further. since you decide to come to my talk page i will respond, one last time. my question re your ability to read the article somewhat intelligently has become a question whether you can read it critically at all. in fact it has become obvious you're not competent to judge, from your comments. inability to recognice and distinguish relevant material is pretty clear. after initiating the process, i had assumed whatever objections encountered by the proposal would be well-informed and educated. whatever the deletion policy is, if all AfD's solicit such ignorant responses, hopefully not too many articles will go thru this nonsense in the future. Mct mht 18:26, 22 May 2006 (UTC)

[edit] Comment on deletion policy

i hope it's not inappropriate to have a comment such as this on the talk page. as can be seen above, i got into it a bit regarding an AfD. the full exchange is here. while that is over and done with, it seems to bring about questions regarding the deletion policy for articles of a particular nature.

my position was that the article derivation of the partition function is technically worthless. i assumed that whatever objections raised would be technically sound. when the justification of the first 2 votes to keep seemed to be superficial and had no apparent technical merit, i mentioned the question whether one is actually "required to read the article somewhat intelligently to enter the discussion" (my words), the responses of the two voters were:

1. one flat out stated that such requirement is unnecessary.

2. the second voter claimed to be insulted and offered further justifications/explanations which reinforced the suspicion that there's no real understanding behind his/her comments.

There is nothing uncivil about calling an ignorant comment what it is. it's unpleasant but it needs to be done. i am very happy, and did, listen to objections/suggestions raised that from those who understand the context, be they disagreements on the specific issues i raised or the overall value in retaining the article. it seems funny that a discussion on the deletion proposal for such an article would attract untrained attention, whose only interest, apparently, is to ensure that some "policy" is followed, as they understand that policy, sensibly or otherwise. the discussion then becomes pointless. as the risk of being overly dramatic, it would be similarly ridiculous to have an amateur sitting on the editorial board of, say, Phy. Lett. X (does it even go to X? :)), and decides what gets in the journal. again at the risk of overdramatizing, this reminds of the story when the physicist Alan Sokal, as a prank, submitted some gibberish to a sociology(?) journal and got accepted. it would be funny to see whether one can duplicate that here, write up some garbage filled with technical jargon, put it on AfD, and see whether it gets defended.

if that's the WP policy, so be it, but then one needs to be extra careful with actions which could bring un-knowledgable attention to articles, such as AfD. Mct mht 22:39, 22 May 2006 (UTC)

De facto, no requirement of specific familiarity with an article is needed, as the first voter said (and as Jitse Niesen also said). The ultimate goal of the debate on AfD is to establish, if possible, a consensus for whether to keep or delete the article. The quality of the debate matters... it matters a lot, actually, while people simply piling on votes matters much less. However, the qualification of the debators does not matter. The way that deletion ultimately works is that after the debate has been open for several days, an administrator will arrive and try to determine whether a consensus exists, and act on it if one does exist. It's impossible for these people to fully understand who is an expert and who isn't, but they can look at the debate and evaluate it.

Another problem is the availability of experts. For articles on an obscure subject, we presume that those who edit the article will notice if it becomes deleted (via watchlists), but in practice, people aren't always active within any given week, and AfD debates only last for a week (not that this would be fixed if they lasted two weeks instead; inactivity can persist for a long time).

Okay, that's the bad news. The good news is that nothing that happens on WP is permanent, which means that mistakes can be undone. If an article is deleted and should be recreated, it can be recreated via deletion review. If an article isn't deleted once, it can still be nominated for deletion again, and can be deleted that time. I completely agree with your last point, but let me rephrase. One must be extra-careful when seeking input from unknowledgeable editors... it's a lousy way to improve articles. This is why I generally try to stop articles from being deleted when the main reasoning in the nomination has to do with concerns that should be addressed by editing, which is exactly why I voted the way I did at the time.

I see your point in disliking this situation... but how else could Wikipedia really operate? This is an encyclopedia that anyone can edit, after all, so we have to accept that for the most part, it's written by amateurs. Mango juice^talk 20:35, 24 May 2006 (UTC)

PS -- here is a fine place to get into it, except that only people who want to talk specifically to you will come here. If you want to try to get Wikipedia to actually work differently, you might want to get involved at the talk pages of some of the policy pages, like, for instance, Wikipedia talk:Deletion policy. Mango juice^talk 20:35, 24 May 2006 (UTC)

here you come again.

1. the vast majority of the technical articles on WP, certainly all the ones i've encountered, along with discussions on their talk pages, are very professional. certainly almost everyone on Wikipedia talk:WikiProject Mathematics seems to be a professional mathematician. that's why i was initially surprised the AfD attracted attention such as yours.

2. first you claim to possess adequate understanding and now say it's an obscure subject. as far as i am concerned, that renders your already zero credibility (in the present discussion) below zero. in any case, there's nothing obscure about statistical mechanics, millions of college kids know it, obscuredness is not relevant anyhow. don't excuse the ignorance.

3. i will leave the policy to the (self-appointed?) WP bureaucrats. however, as stated above, i will certainly be careful with actions that might attract undesirable interest.

hopefully this closes the discussion. and we can stay out of each other's way in the future. Mct mht 20:55, 24 May 2006 (UTC)

[edit] Wikipedia talk:WikiProject Physics

By the by, for future AfDs of physics articles, you can get some technical expertise in the dicussion by mentioning the AfD at Wikipedia talk:WikiProject Physics. That's how all the physicists found out about Wikipedia:Articles for deletion/Derivation of the partition function. — Laura Scudder ☎ 14:05, 25 May 2006 (UTC)

[edit] A request re broken links to deleted article

Greetings! Since you said the worthwhile information from Derivation of the partition function is present elsewhere in the encyclopedia, I infer that you know where it is. I don't, or I would do the following task: please change or remove the links broken by the deletion, which may be found here. (Only the links in actual article pages need fixing.) Ideally, the admin who did the deleting should have done this, but he may not have known to do so or may not have felt qualified to judge what changes should be made. -- Cyan 22:14, 17 June 2006 (UTC)

no problem, will attend to it when i can. or perhaps you can do it as well: among the appropriate replacements for links are microcanonical ensemble, canonical ensemble, grand canonical ensemble, Maxwell-Boltzmann statistics, Fermi-Dirac statistics, etc. Mct mht 22:30, 17 June 2006 (UTC)

ok, it's been done. Mct mht 00:25, 18 June 2006 (UTC)

Many thanks! -- Cyan 23:44, 29 June 2006 (UTC)

[edit] Thanks

Thanks for this cleanup edit! [1]. --HappyCamper 16:37, 16 August 2006 (UTC)

[edit] einstein's elevator vs. einstein's cabin

FYI: einstein's elevator vs. einstein's cabin. --Jtir 17:03, 23 September 2006 (UTC)

thanks for the heads up. both "cabin" and "elevator" can be found in the literature. they convey the same idea. no objections from me if you strongly prefer elevatorvand wanna put it back. Mct mht 19:12, 23 September 2006 (UTC)

[edit] basis function

FYI, I checked a couple of mathematical references and did not find the term. I don't know enough about the subject to have an opinion, but I did find the edit where functional analysis was added to the article. It was in there for three years! I find problems all the time in articles and not just technical ones. Sometimes it is helpful review the edit history to find out just when a problematic change was made. It might then be possible to contact the original editor and ask what he had in mind. If the editor was anonymous and left no edit summary, I feel comfortable removing the material. --Jtir 19:04, 24 September 2006 (UTC)

seems to me that no one bothered to clean up that page, for three years, as you said. i think most mathematicians will agree that the presentation and content is not mathematical. there are a few entries in the edit history that are from mathematicians, with edit summaries like "more work needs to be done". the discussion is in the same vein as what can be found in some physics texts, see for example Intro to Quantum Mechanics (i believe that's the title) by David Griffiths. it's certainly misleading to call it functional analysis. as i said on the talk page, the stuff the article seems to purport to cover is discussed in Hamel basis and Hilbert space in much better fashion. Mct mht 03:52, 25 September 2006 (UTC)

Hi, thanks for your reply. Please continue at Talk:Basis function. --Jtir 11:56, 25 September 2006 (UTC)

[edit] quantum hamiltonian

would you mind taking it a little less personal? what's your problem? it is clear from your own talk page that you attack viciously anthing not to your liking. that might me fair. you also have to agree from time to time that you might have missed a detail and might also not be omnipotent. so i find it fair to ask wether you have other ways of response than labelling something general bs when you don't see all it includes. there is no point or reason in questioning your intelligence but you can slow down insulting mine. thank you. you can reply here, to my talk page or the quantum hamiltonian and i do expect some substance. thank you. andrej.westermann 04:06, 17 October 2006 (UTC)

Wikipedia talk:WikiProject Physics#Quantum Hamiltonian Mct mht 04:18, 17 October 2006 (UTC)

Wikipedia:Articles for deletion/Quantum Hamiltonian Mct mht 17:27, 17 October 2006 (UTC)

why didn't you mention that you contribute to Mathematical formulation of quantum mechanics. This of course explains your vigour. I actually tend to that side, for the record. If we want to get there in a convincing manner, it might help not to get too agressive towards the so called classical community. Not to have a point of view (or to ponder many) can be the soundest scientific position. Wikipedia is as much about points of view as about verification of those points of view. It is not a a bible and does not try to be. so thanks for your efforts, keep it up and take it easy when people ask you questions, as well as it might help to use a softer style yourself. but hey, this is a free world. that has never meant it should be free of all rules. civilized behavior saves a lot of energy for the things that really matter, like getting a deeper understanding of our universe and how we deal with it. take care. 84.227.129.102 15:35, 17 October 2006 (UTC) oops, was not logged in. andrej.westermann 15:55, 17 October 2006 (UTC)

i thought i was done with you. you spout nothing but nonsense bs and then try to hide behind pretense of civility. you're a crank and should be treated accordingly. cranks are about the only people not welcome on my talk page. you keep posting here and i am gonna report you. Mct mht 17:27, 17 October 2006 (UTC)

[edit] Uncertainty principle

This article is hopeless. Material gets added to this article that I have trouble even parsing. Can you make any sense out of the following graf?

However, it should be noted that the Robertson-Schrödinger uncertainty relation, is not the uncertainty as stated in the Heisenberg uncertainty principle. That is, this derivation is inherently only applicable to measurements on a statistical ensemble of systems, and says nothing, contrary to most popular statements, about the simultaneous measurements of individual systems.

--CSTAR 17:26, 26 October 2006 (UTC)

hey, CSTAR. not really sure, i've only heard of, very vaguely, Robertson-Schrödinger states. those are, i believe, states that minimize the uncertainty relation in some way, i.e. when equality is achieved. also, the part "...applicable to measurements on a statistical ensemble of systems..." seems to me is true about the Heisenberg uncertainty principle (not just particular to Robertson-Schrödinger principle, whatever that is), since the Heisenberg uncertainty principle can be viewed as a statement about the standard deviations of measuring different observables. what you think? Mct mht 17:47, 26 October 2006 (UTC)

i just looked at the article and agree it's not in good shape. seems to me a separate article of mathematical nature, where imprecision and verbosity is less likely, could be useful here. Mct mht 18:02, 26 October 2006 (UTC)

[edit] Pure state

Hello. On the 10 June 2006, you merged the article Pure state into Density matrix. The article at Pure state has since been recreated. Could you have another look at the article, and if necessary merge it again? Thanks. Mike Peel 10:39, 27 October 2006 (UTC)

hi, Mike. i believe they can be easily merged again, as the current stub doesn't say anything new and it's probably better to discuss pure states in the context of density matrices. Mct mht 10:57, 27 October 2006 (UTC)

[edit] Collaboration on Enthalpy

Hi there, i apologise for the last-paragraph problem with the Enthalpy article, there's browser problems here which are causing textbox data loss mid-edit. I was wondering if you'd be interested in creating a collaboration project with regards to the Enthalpy article; there's a good basis of information, but it needs verifying and tone-changing.

I think it'd be nice to collaborate with a person of similar interests and expertise as myself. :-) JCraw 13:13, 27 November 2006 (UTC)

thanks for the comment. no need to apologize there. that paragraph happens to have been added by me; it seems to flow better without breaking, is all. i'd be glad to contribute what contents i can and have discussions, although i must emphasize that i don't pretend to be a chemist or experimental physicist. Mct mht 14:37, 27 November 2006 (UTC)

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