User talk:Chas zzz brown

Hello there, welcome to the 'pedia! I hope you like the place and decide to stay. If you ever need editing help visit Wikipedia:How does one edit a page and experiment at Wikipedia:Sandbox. If you need pointers on how we title pages visit Wikipedia:Naming conventions or how to format them visit our manual of style. If you have any other questions about the project then check out Wikipedia:Help or add a question to the Village pump. BTW, thanks for starting presentation of a group. Cheers! --maveric149

Thanks! I can already see that this can be a addicting habit :). I hope to add a few more entries for orphans in the group theory area.

Please use the "minor edit" checkbox when you are only changing formatting, so as to avoid clutter of the Recent Changes page. Thanks --KA

Hi there. Great work on the pictures for the five lemma and homology pages. -- Tarquin 10:03 Oct 26, 2002 (UTC)

Thanks - a picture is worth a thousand words sometimes. Chas zzz brown 19:07 Oct 26, 2002 (UTC)

Yes, great job on diagrams!!! Do you think that you could do a couple for Snake lemma??? ^_^ — Toby 14:27 Oct 29, 2002 (UTC)

Done (with a question on the Talk page). Feel free to request any others you see - they're not hard to set up. Chas zzz brown 21:30 Oct 29, 2002 (UTC)

Excellent, thanks! — Toby 10:39 Oct 31, 2002 (UTC)

Chas, could you take a look at Wreath product? I can't make any sense out of it. AxelBoldt 04:42 Nov 13, 2002 (UTC)

It's basically correct for the unrestricted wreath product, just a bit overly densely presented. I'll add a bit to it to make it a bit more comprehensible. Chas zzz brown 08:29 Nov 13, 2002 (UTC)

moved discussion with Eclecticology re: self-linking maintenance pages to Talk:List of group theory topics

All of the magnetospherical physics related stuff could use diagrams and clarification. Lir 11:43 Nov 18, 2002 (UTC)

Do you know any sexy easy to state open problems in group theory? AxelBoldt 19:53 Nov 18, 2002 (UTC)

I'm at my office; so I don't have time to really check, but there's a nice collection of Open Problems at [1]. I'll see which tickle my fancy - let me know if any seem like fun to you. Cheers Chas zzz brown 01:10 Nov 19, 2002 (UTC)

Another open problem: does every finite group occur as the Galois group of some Galois extension of Q? This is called "the inverse problem of Galois theory." The best general result on this, due to Schafarevitch, is that every solvable group occurs as a Galois group over Q. Chas zzz brown 01:49 Nov 19, 2002 (UTC)

An old open problem, posed by William Burnside in 1902, and known as Burnside's problem, is as follows. Let F_r be a free group of rank r; and consider the normal subgroup N generated by the nth powers of elements in F_r. Define B(r,n) to be the factor group F_r/N. Burnside's problem is, for what values of r and n is B(r,n) finite? The answer is trivial for B(1,n), and is known for values of n in {2, 3, 4, 6}. Zelmanov got the Fields Medal in 1994 for his work on a restricted version of this problem. Chas zzz brown 01:43 Nov 20, 2002 (UTC)

Hi there. I'm puzzled about the large letters 'M' and 'N' which appear on the Changes pages - there's no adequate easy to find explanation of the Changes pages. Can you help? Or direct me to someone who can. Maybe we need an explanation of this. User:David Martland

Hi Chas. I was only editing those mathematics page because they link to differentiation, which redirected to derive, and I had turned that page into a disambiguation page...so I was correcting the links so that they pointed directly to "derive". My focus is on biology (cellular differentiation). adam

Thank you very much for your work on New Age. I started to refactor it a long time ago, but I didn't get past the introduction; it was too overwhelming. ;-) -- Stephen Gilbert 02:39 Dec 11, 2002 (UTC)

Glad to see someone help out on the New Age article. I haven't done much writing since wiki started using passwords for logins. That was over a year ago, and there is nobody to email for help. I could edit anonymously, but I wanted to use the same handle I always used. Wiki won't let me log in because it wants a password, but since there was no password for my handle originally(in 2000) it's a Catch-22. And, once again, nobody here to help out. Keep up the good work, and thanks. BF

I know you did a lot of work on New_Age. Some of the objectivity tends to have a condescending approach, which I corrected. I have no clue where this non NPOV came from, and am not suggesting you did this. btw, i got things "squared-away" again. BF 01:56 Dec 13, 2002 (UTC)

Chas, my answer to your issues raised in Talk:folk_mathematics re mathematical practice are now in Talk:mathematical_practice. The distinction between modern 'mathematics' (vs. calculation or science or weights and measures) as obeying a strict peer review and publication discipline re: its axiomatic proofs, and 'folk mathematics' <-- try to take that as a phrase, not as 'a branch of mathematics', is due in part to Putnam, who made it clear that Plato's ("folk") ontology was in no way part of any realist conception of mathematics, in his 1975 paper. That was a particularly fine distinction that others, notably User:AxelBoldt who finds group theory problems 'sexy' (hm), have failed to make.

24, please note that you are banned from this site. AxelBoldt 01:42 Jan 24, 2003 (UTC)

Hi, there's one last step when making disambiguation pages: put a link to the page on Wikipedia:Links to disambiguating pages. (I already did this for Function (disambiguation).) Otherwise, it looks like you did a good job combining Function and Function (mathematics)! -- Toby 06:48 Mar 4, 2003 (UTC)

Good luck dealing with Fwappler. :-) I have found it impossible to communicate with him/her -- Tarquin 11:47 Mar 11, 2003 (UTC)

Hi Chas, about User:Fwappler's edits to Uncertainty principle, I don't see anything really wrong, except that I can't find any useful info about 'Robertson-Schrödinger relation'. Also I think that the the reference to the Schwarz inequality altough true, is not really relevant (encyclopedia, not a physics textbook). The rest is just small corrections or improvements. -- looxix 23:03 Mar 11, 2003 (UTC)

Hey, Was just wondering how you made the image for Double slit experiment. Looks really nice and one of the more clear diagrams of the experiment I've seen. Laura Scudder 23:44, 2 Mar 2005 (UTC)

Karl Jansen and NDE's

The quote on your page from Karl Jansen and NDE's should probably be qualified, or at least updated. Dr. Jansen has, more recently, stated the following:

'I am no longer as opposed to spritual explanations of these phenomena as this article would appear to suggest. Over the past two years (it is quite some time since I wrote it) I have moved more towards the views put forward by John Lilly and Stan Grof. Namely, that drugs and psychological disciplines such as meditation and yoga may render certain 'states' more accessible. The complication then becomes in defining just what we mean by 'states' and where they are located, if indeed location is an appropriate term at all. But the apparent emphasis on matter over mind contained within this particular article no longer accurately represents my attitudes. My forthcoming book 'Ketamine' will consider mystical issues from quite a different perspective, and will give a much stronger voice to those who see drugs as just another door to a space, and not as actually producing that space'.

(http://www.mindspring.com/~scottr/nde/jansen1.html)

Enigma

Chas,

I was wandering thru Engima talk, and found your original query and my (belated answer), though someone has deranged the ordering. I don't recall ever hearing back from you, so thought to enquire as to whether I actually helped. Did I? ww 14:52, 19 Apr 2004 (UTC)

Hi Chas,

I've (just barely) started filling out the geometric group theory page. How about a diagram of the Cayley graph of F₂ on the free group page? The Cayley graph page could link to it as an example.

Thanks,
David (Dbenbenn 20:23, 3 Nov 2004 (UTC))

Article Licensing

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 2000 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:

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:

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)

Image tag

Hi! Thanks for uploading the following image:

Image:ECexamples01.png

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 wish to release your own work under the GNU Free Documentation License, {{PD-self}} if you wish to release your own work to the public domain, {{fairuse}} if you claim fair use of someone else's work, and so on. Click here for a list of the various tags.

If you don't know what any of this means, just let me know at my talk page , and I'll tag it for you. Thanks so much. Denni ☯ 03:59, 2004 Dec 16 (UTC)

P.S. You can help tag other images at Wikipedia:Untagged_Images. Thanks again.

Here are some more images that you have uploaded, that also don't have image copyright tags:

Silverfish 13:36, 17 Dec 2004 (UTC)

New Mathematics Wikiportal

I noticed you've done some work on Mathematics articles. I wanted to point out to you the new Mathematics Wikiportal- more specifically, to the Mathematics Collaboration of the Week page. I'm looking for any math-related stubs or non-existant articles that you would like to see on Wikipedia. Additionally, I wondered if you'd be willing to help out on some of the Collaboration of the Week pages.

I encourage you to vote on the current Collaboration of the Week, because I'm very interested in which articles you think need to be written or added to, and because I understand that I cannot do the enormous amount of work required on some of the Math stubs alone. I'm asking for your help, and also your critiques on the way the portal is set up.

Please direct all comments to my user-talk page, the Math Wikiportal talk page, or the Math Collaboration of the Week talk page. Thanks a lot for your support! ral315 02:54, Feb 11, 2005 (UTC)

Four color map

Hi, I was wondering if you could provide a version of your four colour map image Image:FourColorMapEx.png without the textured surface (i.e., just solid color regions). The texture greatly increases the filesize of the thumbnails, which we want to keep small if we can. Thanks. Deco 4 July 2005 23:43 (UTC)

Please vote on list of lists, a featured article candidate

Please vote at Wikipedia:Featured list candidates/List of lists of mathematical topics. Michael Hardy 20:22, 13 October 2005 (UTC)[reply]

image tool

hi, i was wandering what tool you use to create your wonderful images, particularly the one on Curvature. do you use xy? --Tob 16:17, 9 November 2005 (UTC)[reply]

Images

I noticed your picture, Image:ECexamples01.png, and I'm wondering what program you use to create such fine examples. Do you mind telling the rest of us? {Slash -|-Talk} 03:17, 16 March 2007 (UTC)[reply]

Inflected wikilinks and pipes

FYI, there is no point in changing something like [[subset]]s into [[subset|subsets]]. Both have exactly the same effect: subsets and subsets, that is, the text subsets as a wikilink to subset. The former of the two is easier on the editors, in writing and reading. --Lambiam 18:37, 31 August 2007 (UTC)[reply]

Five Lemma

The Five Lemma is false in the category of groups, look at my counterexample in the discussion of that article. --Polfborekstraat —Preceding unsigned comment added by 128.12.72.244 (talk) 16:24, 15 October 2007 (UTC)[reply]

See my response there; your example does not commute. Chas zzz brown 21:42, 16 October 2007 (UTC)[reply]

Enumerating Ternary Trees

Chas,

I have been reading your article about Polya enumeration theorem here: http://en.wikipedia.org/wiki/User:Chas_zzz_brown/polya_enumeration I am particularly interested in the enumeration of ternary trees that you describe there. Sadly, I am lost by your final conclusions. You state that it follows that the functional generation formula for T3 is ..., and it seems to me that the value of n has changed by factoring out a z. I do not follow what is being done to generate this formula though. Even more perplexing is the genesis of the recurrence relation that rounds out the example. Please hold my hand.

Thank you,

Keith —Preceding unsigned comment added by 24.2.126.78 (talk) 10:52, 15 November 2009 (UTC)[reply]

Dumb question

Hello Chas - I just posted a "dumb question" on the talk page for Liouville numbers. I see that you seem to know something about this topic. Maybe you could take a look at the post. My question must be truly stupid - no one else has asked it, but it would be glaringly obvious if I were right, so I know that's not it. Thanks Fred1939 (talk) 21:58, 14 December 2009 (UTC)[reply]

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