# User talk:Phys

Hi, I read the article about lie algebra and saw your latex compiled image: http://en.wikipedia.org/wiki/Image:Liealgebra.png which is a bit too small. could you recompile it in a bigger version? --phatsphere 19:24, 28 June 2007 (UTC)

Hi. I was wondering what all of these pages with F4 and G2 are for? They don't really add anything, and it seems they could all be covered in a single page called "F (math)" without using up potentially useful links. For instance Apple releases its processor with the names G3, G4 and G5, and these would be much more commonly asked for than a math page.

G2, F4, E6, E7 and E8 are very commonly used Lie groups in math and physics. Maybe I should rename them G2 (math) and F4 (math)? Phys

Yes please. You can use the Move this page function to do this. Still, wouldn't a single page with lie groups and various examples be more than enough? And if not, could you please state at the top of the articles that **G4** is one of the common lie groups... so we know what it is. This isn't a math textbook!

Huh, there's no G4! Only a G2 and a F4! Phys

Hi there. Good work. Just one point. Avoid using *Math*. That is a word used only in American English. Otherwise people who don't use AE will end up changing them to the international word *Maths* and on such minor points as an *s* edit wars break out! :-( Use the full *Mathematics* instead which is universal. FearÉIREANN 03:10, 11 Aug 2003 (UTC)

Hello! You are adding new articles very quickly. But could you slow down a bit please? How about adding your articles to List of mathematical topics? Or list your contributions in your user page? It is hard to improve your articles if nobody really knows those articles have been created. wshun 23:52, 11 Aug 2003 (UTC)

Hi. I like your contributions to the Mathematical Physics side of Wikipedia a lot. Keep it up! -- Miguel

I'm not convinced that root system should be merged with Lie group. Root systems parametrize a lot of different things besides simple Lie groups and simple Lie algebras. Sometimes with omissions, sometimes with extra markings, they parametrize simple singularities in algebraic geometry, quivers with finitely many indecomposables, finite groups of Lie type, rigid Lagrangian singularities, regular polytopes, affine Kac-Moody Lie algebras, etc. They have an independent existence...-Michael Larsen

Was the move of Technicolor all that wise? Most people are aware of the term in association with film, not so physics. Given the large number of links to technicolor from film pages, it might have been better to leave it as it is, and add a link to the minor usage on the Technicolor page. Otherwise, you'll have to go through and edit all of the links from the films. GRAHAMUK 02:37, 14 Aug 2003 (UTC)

- I've now done this - no need to change any links, or mess about withis any longer. PLEASE!! GRAHAMUK 02:49, 14 Aug 2003 (UTC)

- Oops, I'm sorry! I didn't realize you reverted! I changed the links because you asked me to!Phys

- Yeah, sorry about that!! I saw you making the change so I figured I'd fix it in case you hadn't read this in time - oh well, never mind. I think in general disambiguationpages should be avoided unless there really are a lot of terms that come under one title. In this case, as there are only two and one is (with respect) pretty esoteric, I think this approach is the better one. I'll help revert the film links if you want GRAHAMUK

I don't understand your comment on Cayley's theorem in the adjoint representation entry. Could you elaborate or remove it? Michael Larsen

Your comment on Cayley's theorem belongs in a different article, the not yet written one about regular representations. Perhaps you would like to write it? Michael Larsen

Considering that Dual (category theory) is a single line, is there any reason it's not a part of category theory? No one is going to look for an article with this name. User:Maury Markowitz

- Well, it's on the request list and it's extendable... But if you still insist, I can merge that article. Phys 15:16, 4 Sep 2003 (UTC)

Hi, thanks for correcting my totally wrong definition on Dirac sea (but I'm quite sure that I have seen described as I wrote somewhere...). Anyway, the current version reads like a school textbook question/answer. I think a more "formal" style should be employed - no need for equations, just straightforward definitions. At18 20:01, 5 Sep 2003 (UTC)

Apparently you haven't read the talk page on Liouville's theorem (Hamiltonian) since the time when you created the talk page. Did you intend the differential equation in that article to be the statement of the theorem rather than a corollary of the theorem? If so, that is anything but clear from the way you wrote it. I would never have suspected it if not for your comment on the talk page, and it's still only a suspicion. Michael Hardy 03:22, 20 Sep 2003 (UTC)

- Yes, that's the theorem, not the corollary!

The page is a mess, you know.

Charles Matthews 08:23, 9 Nov 2003 (UTC)

Hello. In relatively complemented, what operation on members of a lattice are you denoting by ? I'd have interpreted it in such a way that if you're talking about the lattice of all subsets of a set, then it's the intersection of *x* with the complement of *y*. But that does not seem to be what you meant. Also, could you address the question I put on the Heyting algebra discussion page. Michael Hardy 03:34, 9 Nov 2003 (UTC)

Not quite sure I understand your latest change to von Neumann algebra. AFAICS, "commutative" already was in every place it should be, and definitely shouldn't be where you put it. Connections between noncommutative von Neumann algebras and measure spaces exist, they just aren't as simple as going from a nice measure space to L^{∞}. So, since this is an aesthetic issue, and I really think we should mention a connection between (possibly non-commutative) von Neumann algebras and measure theory as an explanation for "noncommutative measure theory", I think I'd like to just revert your change.

Prumpf 19:41, 12 Nov 2003 (UTC)

Hi, I'm currently fleshing out coalgebra and was wondering if you still have the source code for ? In the left diagram, the Nabla's should be Delta's, and the whole diagram is kind of hard to read since it is so small. Also, the diagonal arrow in the right one would look better if you used anti-aliasing when converting from postscript (I assume you used TeX?) to png. Could you upload a new version if you get the chance? Cheers, AxelBoldt 16:16, 11 Aug 2004 (UTC)

- Oops, you're right. Thanks for catching that. I'll see if I can still find the source code. Phys 18:06, 11 Aug 2004 (UTC)

## quantum groups (Hopf algebras page)

[edit]Hi, I always considered quantum groups to be a particular class of Hopf algebras. Quantum groups are deformations of function algebras on groups, or their duals. For example, a group algebra of a finite group is a Hopf algebra, but is it a quantum group? Anya

- Well, some people DEFINE a quantum group to be a Hopf algebra, but I guess that's not a universal convention. Phys 19:09, 15 Aug 2004 (UTC)

- Actually, I've also seen the convention that only the deformations of certain Hopf algebras are termed quantum groups; there's a whole book about "Quantum groups" that doesn't have a single clean definition of a quantum group, it just goes over several examples (all Hopf algebras with a certain
*q*in them...). AxelBoldt 12:42, 18 Aug 2004 (UTC)

- Actually, I've also seen the convention that only the deformations of certain Hopf algebras are termed quantum groups; there's a whole book about "Quantum groups" that doesn't have a single clean definition of a quantum group, it just goes over several examples (all Hopf algebras with a certain

Re Talk:Concrete category: would you have an example of a category that doesn't admit a faithful functor to **Set**? Thanks, AxelBoldt 12:42, 18 Aug 2004 (UTC)

Any category that's not locally small? Michael Lee Baker (talk) 17:43, 6 March 2015 (UTC)

Sorry, but I have to comment on this. Redirecting jet bundle to representation of the diffeomorphism group is really quite an annoying thing to do. It is not as if that page made any attempt to explain what a jet bundle is. Charles Matthews 09:06, 22 Aug 2004 (UTC)

## Article Licensing

[edit]Hi, I've started a drive to get users to multi-license all of their contributions that they've made to either (1) all U.S. state, county, and city articles or (2) all articles, using the Creative Commons Attribution-Share Alike (*CC-by-sa*) v1.0 and v2.0 Licenses or into the public domain if they prefer. The *CC-by-sa* license is a true free documentation license that is similar to Wikipedia's license, the GFDL, but it allows **other projects**, such as WikiTravel, to use our articles. Since you are among the top 1000 Wikipedians by edits, I was wondering if you would be willing to multi-license all of your contributions or at *minimum* those on the geographic articles. Over 90% of people asked have agreed. For More Information:

- Multi-Licensing FAQ - Lots of questions answered
- Multi-Licensing Guide
- Free the Rambot Articles Project

To allow us to track those users who muli-license their contributions, many users copy and paste the "**{{DualLicenseWithCC-BySA-Dual}}**" template into their user page, but there are other options at Template messages/User namespace. The following examples could also copied and pasted into your user page:

**Option 1**- I agree to [[Wikipedia:Multi-licensing|multi-license]] all my contributions, with the exception of my user pages, as described below:
- {{DualLicenseWithCC-BySA-Dual}}

**OR**

**Option 2**- I agree to [[Wikipedia:Multi-licensing|multi-license]] all my contributions to any [[U.S. state]], county, or city article as described below:
- {{DualLicenseWithCC-BySA-Dual}}

Or if you wanted to place your work into the public domain, you could replace "**{{DualLicenseWithCC-BySA-Dual}}**" with "**{{MultiLicensePD}}**". If you only prefer using the GFDL, I would like to know that too. *Please let me know* what you think at my **talk page**. It's important to know either way so no one keeps asking. -- Ram-Man (comment| talk)

## Unverified images

[edit]Hi! Thanks for uploading the following image:

I notice it currently doesn't have an image copyright tag. Could you add one to let us know its copyright status? (You can use {{gfdl}} if you release it under the GNU Free Documentation License, {{fairuse}} if you claim fair use, etc.) If you don't know what any of this means, just *let me know at my talk page* where you got the images and I'll tag them for you. Thanks so much. [[User:Poccil|Peter O. (Talk, automation script)]] 05:26, Dec 11, 2004 (UTC)

P.S. You can help tag other images at User:Yann/Untagged_Images. Thanks again.

Assuming you created Image:Algebra.png, can you tag that as well? --Ricky81682 (talk) 07:27, Dec 27, 2004 (UTC)

- Thanks for the quick response! --Ricky81682 (talk) 07:49, Dec 27, 2004 (UTC)

## Punctuation

[edit]Hi there. Having nothing better to do, I am now leading a Crusade about style in math articles. Very often I encounter formulas which are at the end of a sentence. Then, I think one should put period at the end of formula, because the sentence ends threre. Anyway, you did not put period at the end of a formula when you contributed to Hamilton-Jacobi-Bellman equation. It was just several occurences, and it clearly was not a big deal, however, I would like to mention this to you, because it is easier to notify people about something than to always fix things long after. Happy editing! Oleg Alexandrov 23:19, 9 Jan 2005 (UTC)

- Oleg, happened to see this comment. FYI, Paul Halmos, that noted expositor of mathematics, considered the same problem and concluded that one should
*not*add periods after in-line formulas, and many more or less faux-mathematicians, including me, follow his lead. Phys, I hope you will go with Halmos on this! ---CH [[User_talk:Hillman|(talk)]] 02:30, 21 November 2005 (UTC)

## VFD

[edit]Please read the instructions for VFD (at the bottom of WP:VFD or at Template:VfDFooter) before nominating another page for deletion. —Ben Brockert (42) UE News 01:20, Jan 21, 2005 (UTC)

## WKB Approximation

[edit]On WKB approximation, I am not sure what you're trying to say in the paragraph that you added. In my opinion, a discussion of Feynman diagrams is unnecessary in an article on WKB, but I'd be happy if you proved me otherwise. It's just that right now the tie-in is rather incomprehensible to me and the latest addition makes it sound like you're arguing with yourself over it. I think it either needs to be more clearly explained or removed.Laura Scudder 18:18, 10 Feb 2005 (UTC)

## Image sources

[edit]I saw your latex compiled picture in Lie algebra and I'm wondering whether you could attach sources to the respective talk pages when you add new pictures. That would make it easier for others to provide updates and would certainly inspire others when creating their own images. Rl 19:24, 20 Feb 2005 (UTC)

## Creation and annihilation operators

[edit]Just thought I'd drop by and say "hi"! I'm just wondering what other material you plan to add to the creation and annihilation operators page...I don't have much else to add, except maybe stuff on vibronic coupling. Other than that, it's mainly cleanup and rewording to make the concepts more accessible to a larger number of readers. What do you think? I'd also like to convert some of the equations to nicely formatted mathematical equations, but I don't know how to do that. Maybe you have an idea?

I read the comment you left on the discussion page. I assume it was for me, since it looks like we're the only two people actively changing the content on that page (judging by its history). If you feel the need to edit/delete some of my changes, please feel free to do so! :) My perspective is indeed primarily quantum chemistry, so most of my ideas will be centered around the ladder operators. I added those concepts in because I felt that they would help make the article progress towards the more powerful formalism that you've presented with the *-algebras and Hilbert spaces where quantum field theory resides.

If you have time, could you comment on the little section on "notational caveats" I added at the bottom of the page? I think it's relevent to point out the ambiguity in the notation here, as it can be very confusing. Thanks for your input! HappyCamper 23:42, 3 Apr 2005 (UTC)

## Public domain image problems

[edit]Hi there! I noticed that you have placed some of your image contributions in the public domain. Unfortunately, it turns out that one can't place their work in the public domain, and so these image tags have been deprecated. I encourage you to replace the public domain tags on your images with free-use tags, which are similar in spirit, such as {{CopyrightedFreeUse-User}}. Please reply on my talk page or Wikipedia talk: You can't grant your work into the public domain if you have any questions. Thanks. Deco 23:45, 8 Apr 2005 (UTC)

## Broken Link in ADS

[edit]The folowing page has what appears to have been a link to an image. However, it is a link to upload an image. Is this correct?

The Page: http://en.wikipedia.org/wiki/Anti_de_Sitter_space

The link: "Image:AdS A.png"

Softcafe 17:40, 17 July 2005 (UTC)SoftCafe

## Image:Monoid.png has been listed for deletion

[edit]An image or media file you have uploaded, Image:Monoid.png, has been listed at Wikipedia:Images and media for deletion. Please look there to see why this is (you may have to search for the title of the image to find its entry), if you are interested in it not being deleted. Thank you. |

Please don't use "<" and ">" for angle-brackets in TeX. TeX (even in its limited form used on Wikipedia) is sophisticated and has provided for this occasion.

Right:

Wrong:

Notice also:

but

Thus you need to use \left and \right to get the right sizes. Michael Hardy 01:48, 16 October 2005 (UTC)

## Critical point picture

[edit]Hello Phys,

The phase diagram is a nice addition to the critical point page. Can you add a quick note to the talk page giving the details of where the picture comes from? Seems like a good idea for non-user-generated content.

More generally, I wonder if it could also be a nice addition to the phase transition page, which could potentially contain a few diagrams, e.g. the solid-liquid-gas one you provide, but also stuff for Ising model, percolation, Hopfield networks, etc. What do you think?

Best wishes, — WebDrake 10:23, 21 October 2005 (UTC)

- The diagram was created by CYD for another article in Wikipedia. You might want to ask him instead. I was under the impression that any image uploaded to Wikipedia can be used in any other Wikipedia article. Phys 21:15, 21 October 2005 (UTC)

- Yeah, sure, if it can be used one place in WP it can be used in another, it's all covered by the GFDL. I just think that if you add something significant like that to an article you should mention on the talk page where you got it from ("Picture taken from article... etc.) Thanks! WebDrake 16:45, 22 October 2005 (UTC)

## Question about QCD strings

[edit]Are QCD strings the same objects that appear in the Lund string model, or just similar ones? Thanks, SCZenz 16:24, 24 October 2005 (UTC)

- Probably. QCD strings are theoretical whereas Lund strings are phenomenological. Phys 17:39, 24 October 2005 (UTC)

Hi, Phys, forgive me if I have already asked you this but forgotten that I asked you, but can you add a citation to Sakharov for this article, which it seems you started as a stub? TIA ---CH (talk) 00:54, 7 November 2005 (UTC)

- I wasn't aware that Sakharov worked on radions. Phys 15:58, 7 November 2005 (UTC)
- And no, I didn't start this article as a stub. Phys 16:00, 7 November 2005 (UTC)

## AF spacetime

[edit]Actually, I previously removed Category:General relativity and added Category:Lorentzian manifolds to emphasize that this is not a concept in general relativity, but rather a concept in Lorentzian manifolds. Eventually, one would hope to have enough discuss of say Brans-Dicke theory so that we use the term in connection with a Brans-Dicke solution which is not a gtr solution. I guess I'll have to let this stand since you are not the first to complain. ---CH (talk) 02:26, 13 November 2005 (UTC)

- I just noticed that you asked in an edit line for the source of the quotation. I don't know who pasted that in, but I know where it came from. Arghgh!---until earlier today,
*the entire content of this miserable article*was a verbatim quotation of the abstract of the on-line review article by Frauendiener! I added some citations (including F's article) for the benefit of anyone who would like to turn this page into an honest encyclopedia article. (Probably urgent because right now it is a plagiarized paragraph followed by a warning by me that the article consists of a plagiarized paragraph, followed by the citations, which probably won't be acceptable for very long.) ---CH [[User_talk:Hillman|(talk)]] 02:26, 21 November 2005 (UTC)

## Spin tensor

[edit]Thanks for your discussion of spin tensor in continuum mechanics.

I am wondering if you can provide reference for your discussion of this. I have spent some time myself wondering about spin density in contiuum mechanics, especially in turbulence. However, almost universally one encounters the statement that the stress tensor must be symmetric. I would be greatly interested if you could point me to references where the stress tensor is *not* symmetric, especially in turbulence theories.

Thanks, Petwil 20:01, 21 December 2005 (UTC)

## E9 Lie algebra

[edit]Hi, don't know if your still active on Wikipedia. Anyway back in november last year you added a rquest for E9 - lie algebra. I'm fairly sure it does not actually exist as E8 is the largest of the exceptional Lie groups/algebras. Do you have any references for its exsistance. If I don't hear back from you I'll remove it from Wikipedia:Requested articles/Mathematics along with 3j symbol, 6j symbol, 9j symbol, 10j symbol, 15j symbol, Chevalley basis, [[E_{9}]], [[E_{10}]]. --Salix alba (talk) 15:21, 31 March 2006 (UTC)

## Euclidean relations

[edit]In Equivalence relation, you wrote (in effect) that a **Euclidean relation** is a binary relation satisfying a~c, b~c -> a~b. Do you have a reference for this? Not that I doubt you, but I want to cite it elsewhere. (BTW, you also wrote that an equivalence relation is just a relation that is reflexive, symmetric, and Euclidean. But in fact, any reflexive Euclidean relation is necessarily symmetric already!: just plug in a for c.)
--Toby Bartels 12:11, 31 May 2006 (UTC)

## Article in need of cleanup - please assist if you can

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^{(TALK)}01:16, 3 April 2010 (UTC)

## Proposed Image Deletion

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## Pure element listed at Redirects for discussion

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## Nomination of SU(6) (physics) for deletion

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## "Theta vacuum" listed at Redirects for discussion

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## "Algebra/set analogy" listed at Redirects for discussion

[edit]
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## "Nonsingular" listed at Redirects for discussion

[edit]
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## The "Critical exponent" article was really good

[edit]The Invisible Barnstar
| ||

I am so impressed by the table in Critical exponent that I found out who wrote it. It's you, at https://en.wikipedia.org/w/index.php?title=Critical_exponent&oldid=27474772
I would like to give you a big star. |

pony in a strange land (talk) 00:31, 19 July 2023 (UTC)

## "Translation (mathematics)" listed at Redirects for discussion

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## "Simple root" listed at Redirects for discussion

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