User talk:Rgdboer

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Hello Rgdboer and welcome to Wikipedia! Hope you like it here, and stick around.

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Hi. Welcome to Wikibooks from me also. Style tips: you don't need to add spaces to the start of every line. Just type normally and let the text wrap around. Please italicise variables also. You might be interested in Wikipedia:Wikiproject Mathematics. Dysprosia 02:08, 7 Nov 2004 (UTC)

Contents 1 Leaf vegetables 2 Whole grain 3 Tessarines, hypercomplex number 4 Thanks again - coquaternion, hyperbolic quaternion, etc 5 The "complex plane" 6 Thanks for expanding Isaak Yaglom 7 Your extraordinary degree of detail, precision, and insistence of historical facts 8 Solicitation 9 Invitation 10 Thoughts on Vector (Gibbs-Heaviside)[now deleted] 11 Walter Bradford Cannon 12 Economic crisis of 2008 13 Nine-point hyperbola 14 Graphics lab 15 Pappus harmonic theorem 16 AfD nomination of Tessarine 17 Tessarines 18 Routh's theorem 19 Alexander Macfarlane (mathematician) 20 Screw theory 21 Steinmetz

[edit] Leaf vegetables

There is now an article leaf vegetable, which you might find convenient for the self description on your user page.

Regards — Pekinensis 00:56, 19 Mar 2005 (UTC)

[edit] Whole grain

There is now an article whole grain, which you might find convenient for the self description on your user page.

Regards — Pekinensis 22:40, 15 Jun 2005 (UTC)

[edit] Tessarines, hypercomplex number

Dear Rgdboer,

I've added some isomorphic algebras to the article on tessarines which you may find interesting. In my eyes, tessarines with complex number coefficients actually form a mathematical field (not just a ring), since they are commutative, associative, and contain a multiplicative inverse for any non-0 element. If you agree, we could change this.

I'm currently asking around for opinions, also because of some concerns I have added to the discussion page of the hypercomplex number article. I'm currently soliciting comment from various parties, including you (since you've written much about non-traditional numbers in Wikipedia). Any feedback is appreciated; if you are in disagreement, or have a different suggestion, please respond on the discussion page of hypercomplex number to simplify the discussion.

Thanks, Jens Koeplinger 15:06, 19 July 2006 (UTC)

Thanks for letting me know that tessarines contain numbers with determinant t = zz - ww = 0, and are therefore not a field. Thanks, Jens Koeplinger 13:39, 20 July 2006 (UTC)

Hello. I've replaced the hypercomplex number article with a complete rewrite, which should include all previous content and statements, but with much more detail and categorization. I'm referring to many pages you've been editing here, and would appreciate any feedback. Thanks, Jens Koeplinger 22:36, 31 July 2006 (UTC)

[edit] Thanks again - coquaternion, hyperbolic quaternion, etc

Rgdboer, thanks again for your help, clarifications, and clean-up that led to good improvements to several number system articles. When I started adding isomorphisms, I first noticed one here, then another there, and over the past two months there turned-out to be a flood of isomorphisms, many of which I've for now put on hold with adding. Maybe some time later we may want to think about creating a section on each of the number systems that are currently being referenced from hypercomplex number, and title it "Isomorphisms"? We could place such a section at the same position at each article, e.g. before or after the "See also" section, or maybe even as a subsection to the "See also"?

From my end, I'll slow down for a few months, to see what comes out from the Musean hypernumber debate. I had contacted authors of two more hypercomplex extension programs, which are currently not listed in Wikipedia at all, but after seeing what happend to the authors of the material which I refered to for the Musean hypernumber article, I better not dare to ask anyone whether they still want me to write-up a Wiki article about their numbers :) ... For good reason, of course. On the other side, I'm not comfortable in representing works from certain sources in a way that differs conceptually from these sources - which seems to be what some may have requested for the Musean hypernumber article ... also for good reason.

Anyway, let me know if there's anything urgent that you'd like to see done in Wiki (errors; bad, incorrect, or misleading statements - anything that really shouldn't be here).

Thanks again, Jens Koeplinger 00:43, 23 August 2006 (UTC)

[edit] The "complex plane"

Hello, Rgdboer!

I'm responding to a remark you put on the talk page for this article.

I have recently added a substantial amount of new material to this article, and I included a small section (Other meanings of "complex plane") near the end. I hope I've addressed most of your concerns. Since you seem to be a lot keener on abstract algebra than I am (although I did take a course on group theory from a guy named Aschbacher a long time ago), I'd appreciate your assistance with one little thing.

I'd like to add one or two more paragraphs explaining why the (Eulerian/Gaussian) complex numbers have generated so much interest in analysis, while the other 2-dimensional algebraic extensions of the reals (split-complex, dual numbers) have not generated such a vast literature. I suppose it's mainly because you can't get a positive definite norm on the split-complex / dual numbers. That, and the fundamental theorem of algebra. Anyway, I'd appreciate hearing more about your views before I write those one or two additional paragraphs. Or maybe you'd like to stick something in there.

Oh -- on the "complex plane" as C×C, I'm thinking that some allusion to Cantor's mapping of C into R might be fun to put in there. What do you think?

Have a great day!  ;^> DavidCBryant 23:56, 6 January 2007 (UTC)

[edit] Thanks for expanding Isaak Yaglom

Thanks for expanding Isaak Yaglom and for adding the annotated list of works. What was your source for the biographical details you added? --Jtir 15:48, 10 June 2007 (UTC)

All the biographical information I used is from the Russian Mathematical Surveys v.44 obituary listed in the references. Rgdboer 22:27, 11 June 2007 (UTC)

Thanks. I have added <ref> tags citing it. I added an introductory sentence to the Institutes and titles section to have a place to hang the <ref> tag there. --Jtir 22:07, 12 June 2007 (UTC)

[edit] Your extraordinary degree of detail, precision, and insistence of historical facts

Robert - during the past year or so I've come across several of your edits in certain algebra related articles, most recently in the discussion about merging split-/para-/hyperbolic-/coquaternions into one article. During every edit you have exhibited an extraordinary desire to present and preserve historically and factually correct information. It is your diligence that actively provides better and more profound support of factual and historical information in Wikipedia. Therefore you truly deserve:

		The Barnstar of Diligence
		For your active contribution and clarification of historical facts in 19th century algebra related articles. Jens Koeplinger 01:06, 11 June 2007 (UTC)

Thank you.Rgdboer

[edit] Solicitation

Hello Rgdboer, I am very interested in your work about inversive rings and conformal geometry. So I wish to know how I could adquire more information about your work, maybe books or papers... I am a spanish researcher and my email is XXXXXXXXXXXX. Thanks you very much —Preceding unsigned comment added by 157.88.131.7 (talk) 11:48, 7 September 2007 (UTC)

Please do not leave your e-mail address here, for your own sake, as this is a public place. Generally the "User talk" is for Wikipedia business: pages in development, work done or to be done, progress reports. If you have a need to contact me personally for any reason, click on the "E-mail this user" in the left column toolbox. I will reply and we can carry on our research or what have you.Rgdboer 22:37, 13 September 2007 (UTC)

[edit] Invitation

This "User talk" space is for whatever comments or concerns may arise from readers at large or WP editors. Just click on the "edit" to the upper-right, and when the "Editing" window opens begin typing at the left margin.Rgdboer (talk) 20:56, 12 February 2008 (UTC)

[edit] Thoughts on Vector (Gibbs-Heaviside)[now deleted]

I noticed your work on Vector Analysis (Gibbs/Wilson). I'm wondering if an editor of a related-article would have some thoughts on the Vector (Gibbs-Heaviside) article. Very happy to learn first hand your thoughts on it or those of current and possible future wikipedia articles on vector analysis. --Firefly322 (talk) 11:09, 8 March 2008 (UTC)

You have my recent remarks at Talk:Vector (spatial)#Historical remarks. Beyond that let me keep researching, reading, studying, and thinking.Rgdboer (talk) 00:07, 12 March 2008 (UTC)

[edit] Walter Bradford Cannon

Hi I am from the country of your Grand Parents. You just made added a "high school mentor" to the Walter Bradford Cannon. Could you tell me your source, because I couldn't find this on Google. -- Marcel Douwe Dekker (talk) 22:12, 17 June 2008 (UTC)

Hi Mdd: Saul Benison (1987), WBC: Life and Times a Young Scientist. I'll get the page number soon. Have added this book and a 2000 sequel to the references. I would also like to eventually work in his relationship with G. W. Pierce. The formation of these individuals interests me greatly.Rgdboer (talk) 22:20, 17 June 2008 (UTC)

Thanks. I think you should add this source to the article itselve with a reference-tag. I wikified your other contributions myself. Good luck. -- Marcel Douwe Dekker (talk) 22:31, 17 June 2008 (UTC)

[edit] Economic crisis of 2008

Hi, I just wanted to let you know I reverted your edit to Economic crisis of 2008 as it sounded too much like wp:or. If you have some sources for this, please feel free to reinsert the information. NJGW (talk) 00:33, 12 July 2008 (UTC)

References on Age wave so no OR. Difficult to blame constrictive population pyramid cause for stagnation.Rgdboer (talk) 21:25, 12 July 2008 (UTC)

[edit] Nine-point hyperbola

Hello. I just added nine-point hyperbola to the list of triangle topics. If you know of others that should be there and are not, could you add those too? Thanks. Michael Hardy (talk) 20:26, 13 July 2008 (UTC)

[edit] Graphics lab

I've replied to your request at the graphics lab here. --pbroks13^talk? 22:37, 13 July 2008 (UTC)

[edit] Pappus harmonic theorem

I've replied to your query at Talk:Projective_harmonic_conjugates Dickdock (talk) 21:34, 6 September 2008 (UTC)

[edit] AfD nomination of Tessarine

I have nominated Tessarine, an article you created, for deletion. I do not think that this article satisfies Wikipedia's criteria for inclusion, and have explained why at Wikipedia:Articles for deletion/Tessarine. Your opinions on the matter are welcome at that same discussion page; also, you are welcome to edit the article to address these concerns. Thank you for your time. Ben (talk) 08:12, 11 September 2008 (UTC)

[edit] Tessarines

Hi, could you please look at that page: Talk:History of special relativity#Tessarines?. It's about the inclusion of the section "Mathematical Background" in the article and the importance for the history of special relativity. --D.H (talk) 21:16, 28 October 2008 (UTC)

[edit] Routh's theorem

You added the following text to the article on Routh's theorem:

This theorem was given by Edward John Routh on page 82 of his Treatise on Analytical Statics with Numerous Examples in 1896. The particular case r = s = t = 2 has become popularized as the one-seventh area triangle.

I checked page 82 (and several other pages) of that Treatise (which most people date to 1898 instead of 1896), but could not see any mention of this result. Could you double-check that reference? —Preceding unsigned comment added by 63.24.55.224 (talk) 21:08, 2 November 2008 (UTC)

Oh, never mind... I found it in a different edition of that Treatise. (The page numbers must have changed.) Thanks. —Preceding unsigned comment added by 63.24.119.58 (talk) 02:17, 3 November 2008 (UTC)

[edit] Alexander Macfarlane (mathematician)

Hi, I'd be glad to help, but I'm bit busy this week with finals and papers and all. Leave me a message with how/where I can access this letter and I will do what I can to find the information to you (assuming that I can access it of course!) next weekend or so. Cheers, CP 19:14, 30 November 2008 (UTC)

Thank you Canadian Paul for chasing down that letter from Helen Macfarlane in the archives at your university.Rgdboer (talk) 02:10, 8 January 2009 (UTC)

[edit] Screw theory

Hi Rgdboer - happy new year! A few month ago, you asked me a question regarding the calculus of screws. I just got an email that there will be a summer school for screw theory based methods in robotics (here), and I thought you might be interested in taking a look. --Jiuguang (talk) 16:23, 13 January 2009 (UTC)

My interest in screw algebra stems from efforts to improve the articles on Eduard Study and his biquaternions. I learned of a line of work by Yang, McCarthy, Rooney, and Baker; see dual quaternion#References. Some of the math puzzled me so I started asking around, including User talk: Jiuguang Wang. Good to see math for robotics etc., but some claims seem dubious.Rgdboer (talk) 01:28, 1 February 2009 (UTC)

[edit] Steinmetz

Your edits on the Charles Proteus Steinmetz were very interesting as to information, and it fits pretty well with what I know about him also... but could you find outside references say to the book or a book about the book to make a ref/citation note to the information? If there is a copy of the book you mention on line or a description of the passages that would work well I think or a book about the book. If you have something like that and do not have the time to connect it together I could probably do it also if you could give me a link to further info. Best wishes to you. skip sievert (talk) 23:00, 30 May 2009 (UTC)

The latest biography of Steinmetz is Ronald Kline (1998). Reading that biography in connection with his applied complex variable work, brought me to his essay on "political economy" which anticipated a convergence between corporations of industrial and social type. Due to the current events that show Steinmetz had some insight 93 years ago, I read through the book, selected a couple key quotes, and contributed the now deleted addition to his biographical article.Rgdboer (talk) 22:10, 31 May 2009 (UTC)

I was able to find this,, as to the book you are referring to... Despite his efforts, by 1922 Steinmetz concluded that socialism would never work in America because the country lacked a "powerful, centralized government of competent men, remaining continuously in office" and because "only a small percentage of Americans accept this viewpoint today. That was written by Kline.. here is a link [1] - I am a fan also of Steinmetz as you are. He was a notable genius very obviously. You may find it interesting to investigate his involvement at Columbia University in the Technical Alliance. My guess is that he modified his view very significantly between when that book was written and his death. The concept of [2] was the focus of his last few years I think. This revolves around something connected with this [3] in an Energy accounting system using Thermoeconomics in a non monetary system... so that pretty much eliminates corporations as are known in that sense. That does not take away from his book at all published before his contact with that group and it would be good to add some of the info... and put it all into context in the article. Here is another link you may find interesting [4] If this information is not interesting to you please just ignore it. Regards, skip sievert (talk) 22:58, 31 May 2009 (UTC)