Bjcairns

I am a PhD student in probability theory and stochastic processes at the University of Queensland in St Lucia, Queensland, Australia. My main interest is in applications of stochastic processes (such as Markov chains) to biological and other 'complex systems' systems. ==Contributions== My contributions include: * I am involved in the following Wikipedia:WikiProjects: :Wikipedia:WikiProject Probability, Wikipedia:WikiProject Mathematics, Wikipedia:WikiProject Mathematics/PlanetMath Exchange. *New contributions to: :Ross River virus, Phase diagrams of the logistic map (:Image:Logistic map scatterplots small.png, :Image:Logistic map scatterplots large.png), Constant random variable, Laplace-Stieltjes transform, applied probability, Lebesgue-Stieltjes integration, Fatou's lemma, probability generating functions, Markov's inequality, Abel's theorem and population processes. *Significant contributions to existing articles: :Logistic map, Probability mass function, Convergence of random variables, Markov property. *General contributions to articles on mathematics, especially those concerning applied probability. ==.plan== In lieu of a real .plan file, I'll just state my plan! :I recently found the sunset article. It has such a lovely set of pictures (not to mention that it's an interesting topic) that I've decided to start bringing it up to Wikipedia:Featured articles standard. Have a go yourself! :--User:Bjcairns 04:57, 31 Jan 2005 (UTC). The User:Bjcairns/plans... ==Things to do...== * Rework the articles moment (mathematics), moment about the mean, skewness, kurtosis, leptokurtic and platykurtic. These need to be made consistent in style and complementary in content. * Clean up probability density function and cumulative distribution function. * Consider merge of continuous random variable and discrete random variable into random variable. ==External links== My personal and professional web site can be found here: * http://www.maths.uq.edu.au/~bjc/ It includes a summary of my research interests and published and submitted papers. ==Copyrights== For the moment, while the GFDL remains the sole official license under which the Wikipedia is released, I choose not to multi-license my contributions. Above all, I think that it is important to have a common approach to copyright issues, and I'm not sure that I understand (or even agree with) the politics behind the recent multi-licensing push.

Bjcairns

Welcome to my talk page. Please feel free to comment on anything here! Cheers, User:Bjcairns. == Tips == Hello Bjcairns. I'm glad to see another person contributing to articles on probability. Two pointers: * There's no need to write dogs , because writing dogs has the same effect. * Could you add any new articles on mathematics that you create to the list of mathematical topics. User:Michael Hardy 01:41 31 May 2003 (UTC) ---- Hi from me too :) I've replied to your kind message on my User talk:Dysprosia, by the way... but here are some links to help you get started... * Wikipedia:Welcome, newcomers * Wikipedia:How to edit a page * Wikipedia:Village pump - ask questions you may have here, or leave a message on my User_talk:Dysprosia Have fun :) User:Dysprosia 03:59, 14 Nov 2003 (UTC) :Thanks, Dysprosia. I really appreciate the helpfulness of Wikipedians -- I am currently trying to re-learn all the wiki-tricks that I've forgotten in the last few months, so I may well have to take up your offer and ask a few questions some time. User:Bjcairns 04:41, 14 Nov 2003 (UTC) == Desargues' theorem == Hi. Thanks for your work on Desargues' theorem. User:Michael Hardy 20:32, 2 Dec 2003 (UTC) :No problem :) If you have anything else that needs converting like that, just let me know. User:Bjcairns 21:40, 2 Dec 2003 (UTC) OK, how about . That can be used in the same article. User:Michael Hardy 02:17, 5 Dec 2003 (UTC) :Done! User:Bjcairns 04:06, 5 Dec 2003 (UTC) == WikiProject: Probability == I think your probability textbook idea could work. It will be a lot of work though. User:Michael Hardy 02:17, 5 Dec 2003 (UTC) :Thanks for the quick response. At this stage, I don't want it to be a lot of work as a textbook, but rather a "guide to learning probability from the Wikipedia for people who want to learn probability from the Wikipedia". Thus, I wouldn't suggest that anyone supply the missing parts just to have a complete table of contents. Horse before the cart, and all that. User:Bjcairns 04:06, 5 Dec 2003 (UTC) == Perfect (Logistic map) == Hi Kevin. Good to see some engagement with my recent addition to the Logistic map article. However, I stand by my original text. I think that it is in fact true, but I take what may be your point -- it is not entirely clear on the whole story. What I had written was meant to say that if we had perfect knowledge of the system and its initial state, then ''in principle'' we could know every future state -- I mean this in precisely the sense that it is deterministic. Of course, if we were measuring a system or using a digital computer to calculate the future states, then we would have imperfect knowledge or we would fail ''in practice'' to accurately calculate future states. But, perfect is, well, perfect, and immeasurability has nothing to do with it. I'll make the change to what I meant, and try to incorporate your edit as well to make it clearer. User:Bjcairns 02:27, 10 Dec 2003 (UTC) : perhaps you misunderstood my argument. it is philosophical in nature. if the word "perfect" is to have any ''meaning'' it must have information content with respect to an interpretive system; it must provide a method of distinction, such as the distinction between "perfect" and "imperfect". Any system of distinction so posited would prove to be susceptible to the logic that i stated in my argument on the logistic map page. If it is not susceptible - it it is not susceptible to any system, then it has no meaning - then it is an unevaluated construct. : Ultimately, there is no such thing as "perfect". There is always only "perfect in respect to" some criteria which is considered primal. : If, on the other hand, as the logic you wrote on my talk page seems to imply, you mean only that you are constructing the meaning of the word "perfect"; that ''if'' one can predict the future state of the system, ''then'' one has perfect knowledge, and not the other way around - if you mean only to say this, then it is meaningless to say that your definition meets its own criteria, as it is meaningless to say that "if a jghalg is neccessarily blue, then blue is neccesarily the color of a jghalg". This statement also tells one nothing about the nature of the color blue. Just as an analogous statement about "perfect" and "logistic maps" tells one nothing about the nature of logistic maps. : Furthermore, to have "perfect knowledge" (which is ontologically impossible and therefore completely absurd) by your definition, one would have to be able to predict the outcome of the logistic map forever, which is longer than the logistic map itself would be around, and longer than the "knowledge" would be around. : If, however, the knowledge is "around forever", is "static", then it stand in no casual relation to anything, because it not caused by anything nor does it effect anything, and therefore it is immeasurable and meaningless; it has no correlation to anything. It is a symbol without identity. : I hope that's enough. -User:Kevin_baas 2003.12.10 In response to your reply on my talk page, I think we agree philosophically about the impossibility of obtaining perfect knowledge about something, but that does not make the concept of perfect knowledge meaningless. I think that the word "perfect" as I used it would be understood by most of the Wikipedia's readers as meaning what I intended it to mean, and moreover the contrasting point about the impossibility of perfect knowledge in practice has been made in the article. However, in response to your comments, I'll have a go at defining "perfect" more clearly.
--User:Bjcairns 23:54, 10 Dec 2003 (UTC) : I like what you've done to the page. I think I"ll alwys have a problem with whateveer sentence contains the word perfect, but you don't have to bother fixing it. Just to be clear, I am disagreeing with perfect ''in principle'', not just in practice. Please don't try to define the word "perfect". That's laughable. -User:Kevin_baas 2003.12.10 Thanks again for your comments. You have an interesting view on 'perfect' -- and I'm happy we can agree to disagree. User:Bjcairns 22:18, 11 Dec 2003 (UTC) == Olduvai theory == http://en.wikipedia.org/w/wiki.phtml?title=Olduvai_theory&oldid=1775035 You said the following about the above revision: :''Possible copyright violation.'' How is that possible? The article stated: :''The two paragraphs below are quoted from the abstract of the paper in which this theory was introduced.'' Also, the paper that introduced this theory does not have a copyright notice on it. This has no relevance to the development of that article; I was just curious as to what constitutes a "copyright violation". == Admin nomination == Hello. Aside from the ongoing discussion at talk:Bayes' theorem -- I noticed that you are not an administrator but I think you ought to be. I will nominate you if you wish. You may reply here or on user talk:Wile E. Heresiarch. Regards & happy editing, User:Wile E. Heresiarch 16:10, 27 Jan 2005 (UTC) : Wile, thanks; I greatly appreciate your offer. Wikipedia is the single greatest thing on the Web, so it is with great reluctance that I must decline. I'm currently in the last year of my doctorate, and my contributions have been, and most likely will be, somewhat sporadic—I can scarcely believe it myself, but my list of contributions is remarkably short for the time I've been here. :) Perhaps in a year or so! Cheers, User:Bjcairns 22:38, 27 Jan 2005 (UTC). :: No problem, let me know if you change your mind. As ever, keep up the good work. Btw I will respond again on talk:Bayes' theorem but I'm trying to think up a suitable intro section that will make everybody happy (or at least nobody unhappy). I promise not to let it slide for 6 months again. 8^) Happy editing, User:Wile E. Heresiarch 09:11, 29 Jan 2005 (UTC)

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