User talk:CRGreathouse

User : Drift chambers etc

category Reality also contains the article Potentiality and actuality

so perhaps there was a mistake on your part to remove this category, as at least some content of the article would in the future contain information relevant to this aspect of philosophy and would therefore be helpful to person's in navigation , so will be returning this category Drift chambers (talk) 20:27, 7 March 2012 (UTC)

Is useful to include because of the nature of infinity in the spatial infinite is that in an infinite universe the material elements are sharing a border with the supposed vacuum of empty space that is around the most outer stellar formations.→ [1][2]

will be returning Cat : Philosophy of Science on the grounds of this :

the stars etc of the universe (i.e. the stellar formations ) are availble to science to examine but infinity currently isn't (i.e. the furthest object observed by telescopy isn't the actual furthest universally) so is necessitated in science but also at the same time unavailable to scientific methods

will be returning Category : Belief on the grounds of these , with references available at → [3]

The notion of an infinite God, perfect in every way, is true of Christian belief. [34] God is defined as that which transcends the infinite Good, [86] The acceptance of the infinity of God is the decree of ecclesiastical dokein [88]

Drift chambers (talk) 21:03, 7 March 2012 (UTC)

in response to your reasoning that the categories were not useful to the understanding, be assured that the infinity itself is of no use at all, the term has no practical application (that is no practical application in science that might be of use so the term is useless in the world really - known of by this editor anyway, in respect to infinitity relevant to division i.e. the division of matter in science i.e. quantum physics) the concept is very much like the statement:

All art is quite useless.

O.Wilde ( contains adverts [4]) → [5]

Drift chambers (talk) 21:31, 7 March 2012 (UTC)

Infinity is quite a useful concept, at least for mathematicians and probably for others. On the other hand, I don't see how adding that category would be. Certainly category membership is not transitive across links in the article -- I don't see why the article would merit the category just because Potentiality and actuality does. CRGreathouse (t | c) 22:30, 7 March 2012 (UTC)

Preon star

To avoid collapse into a black hole the mass m and radius r of a must satisfy

$r<{\sqrt {\frac {3c^{2}}{8G\pi \rho }}}$

or equivalently

$m<{\sqrt {\frac {3c^{6}}{32G^{3}\pi \rho }}}$

where G is the gravitational constant, c is Einstein's constant, and ρ is the density of the preon star. For ρ = 10²³ kg/m³, this gives a radius of at most 40 m and a mass of at most 2.7×10²⁸ kg.

CRGreathouse (t | c) 04:54, 8 December 2011 (UTC)

Hello, CRGreathouse. You have new messages at OwenX's talk page.
You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

About the "Author" field in the {{MacTutor}} template

Hello, CRGreathouse. You have new messages at Template_talk:MacTutor#A_proposal.
You can remove this notice at any time by removing the {{Talkback}} or {{Tb}} template.

Daniele.tampieri (talk) 12:32, 7 January 2012 (UTC)

Eidos RfC

Hello, there is an RfC concerning the Eidos page in which you have shown interest in the past. This is a small notification in case you may wish to take part in the discussion. Salvidrim! 20:44, 16 January 2012 (UTC)

Your use of rollback

Would you please explain how the following uses of rollback follow the rollback policy?

• Here, you revert the apparently innocuous change of "common" to "some".
• On Sieve of Eratosthenes, you rolled back a minor addition.
• In these three edits, you reverted an apparently sourced addition of content which unfortunately contained one sentence of original research. Couldn't you have just removed the comment?
• How does this follow the guidelines for rollback use?
• This was merely an inaccurate wording change.

Thank you. Reaper Eternal (talk) 19:06, 17 January 2012 (UTC)

Help desk item you might find of interest.

You may be interested (as de facto OEIS liason) in Wikipedia:Reference desk/Mathematics#number of non-isomorphic hamiltonian cycle on n-cubes?.--RDBury (talk) 17:25, 25 January 2012 (UTC)

MSU Interview

Dear CRGreathouse,

My name is Jonathan Obar user:Jaobar, I'm a professor in the College of Communication Arts and Sciences at Michigan State University and a Teaching Fellow with the Wikimedia Foundation's Education Program. This semester I've been running a little experiment at MSU, a class where we teach students about becoming Wikipedia administrators. Not a lot is known about your community, and our students (who are fascinated by wiki-culture by the way!) want to learn how you do what you do, and why you do it. A while back I proposed this idea (the class) to the community HERE, were it was met mainly with positive feedback. Anyhow, I'd like my students to speak with a few administrators to get a sense of admin experiences, training, motivations, likes, dislikes, etc. We were wondering if you'd be interested in speaking with one of our students.

So a few things about the interviews:

• Interviews will last between 15 and 30 minutes.
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• The entire interview process is being overseen by MSU's institutional review board (ethics review). This means that all questions have been approved by the university and all students have been trained how to conduct interviews ethically and properly.

Bottom line is that we really need your help, and would really appreciate the opportunity to speak with you. If interested, please send me an email at obar@msu.edu (to maintain anonymity) and I will add your name to my offline contact list. If you feel comfortable doing so, you can post your name HERE instead.

If you have questions or concerns at any time, feel free to email me at obar@msu.edu. I will be more than happy to speak with you.

Thanks in advance for your help. We have a lot to learn from you.

Sincerely,

Jonathan Obar --Jaobar (talk) 02:42, 9 February 2012 (UTC)

Your continued use of rollback

I see that you have made no response to Reaper Eternal's message above, and also that you have continued to use rollback in ways that do not, on the face of it, appear to comply with the provisions of Wikipedia:Rollback feature. For example, this and this both look like reverts of good faith edits, and I cannot see anywhere where you explained your reasons for those reverts. Please do explain why you think your use of rollback is acceptable, as a user has indicated that they think you have been abusing rollback, as you can see at User talk:WillNess. JamesBWatson (talk) 11:50, 10 February 2012 (UTC)

There's not much to say -- when I edit (especially from mobile devices) my fat finger often hits "rollback" instead of "undo". Occasionally I make a null edit to explain, but usually it's not worth the hassle. Certainly whenever it becomes an issue I discuss it on the Talk page.

I wasn't aware that that WillNess was mounting this sort of campaign against me, thanks for pointing that out.

CRGreathouse (t | c) 14:47, 10 February 2012 (UTC)

Sikorav

Hi, Please restore the page Jean-Claude Sikorav if you get a chance. Tkuvho (talk) 16:02, 27 February 2012 (UTC)

Looks like CBM already did. CRGreathouse (t | c) 20:32, 7 March 2012 (UTC)

Block this IP

To prevent accidental vandalism, please place a block on this IP [anon-only, account creation enabled] — Preceding unsigned comment added by 38.116.204.34 (talk) 13:10, 23 March 2012 (UTC)

Akritas2's edits

Hi,

I acknowledge the revert of Akritas2's edits you have done in Sturm's theorem. There is a similar problem in Root-finding algorithm (see [6]). Could you look at this?

Also, Budan's theorem is a page written by Akritas2, which is entirely devoted to the personal views of Akritas on the history of mathematics. What to do with it?

D.Lazard (talk) 16:08, 17 April 2012 (UTC)

I am not sufficiently familiar with the material at Budan's theorem to be comfortable editing there. My conclusion was the same as yours, but I feel out of place making changes without more topic knowledge.

I've been thinking about how to address the issue at Root-finding algorithm where I am more knowledgeable. I'm not sure if the material should be reverted, shortened, or rewritten. As I'm able I will make edits there.

CRGreathouse (t | c) 16:13, 17 April 2012 (UTC)

Thanks D.Lazard (talk) 17:59, 17 April 2012 (UTC)

Hello,

I am astonished that the author of the Sturm article claims that Sturm's method is available "in every computer algebra system". That is simply not true; he admits as much by claiming in his other article on root finding algorithms that maple has the Vincent-Collins-Akritas method as the default method! Mathematica, always had the VAS algorithm. (S works for Mathematica.) Sage also, etc etc ...

Besides, Sturm's method is to be compared with other methods; why does he not want this comparison? I believe that Lazard (whom I have never met or interacted with in the past) is the one who tries to impose HIS limited point of view on the readers. Besides, (assuming good intentions) his knowledge of English did not allow him to differentiate (in the article on root finding algorithms) between "Uspesnky's method" and "modified Uspensky's method" and he thought the two were interchangeable.

Also, on Sturm's theorem he talks about bounds and the only one that came to his mind was what he calls Cauchy's bound; Cauchy gave a bound ONLY on the positive roots and NOT on the absolute value of the roots. The mathematicians of the 19th century knew better. See my article on root bounds and Bourdon's algebra.

In summary, I have only ADDED material to the above mentioned articles and DID NOT ERASE anything Lazard wrote. I expect the same courtesy from him as well. He got his point and I have mine and I think both need to be taken into consideration. But we both have to write accuracies. So, I expect Sturm's method to be reverted to the previous version where I was saying that Sturm's method was used by "everybody until about 1980 --- when it was replaced by methods derived from Vincent's theorem", along with the supporting references.

And I close with the following: If Lazard does not like anything on my Budan article he should say so and explain the reason he does not like it. Saying that the article is "... entirely devoted to the personal views of Akritas on the history of mathematics" proves nothing; he should tell us his own views -- if he has any. My views have already been judged by peers.

Alkis — Preceding unsigned comment added by Akritas2 (talk • contribs) 10:26, 19 April 2012 (UTC)

I'm glad you're discussing matters! But the best place for that is on the Talk pages of the affected articles, not here. CRGreathouse (t | c) 21:04, 19 April 2012 (UTC)

Talk:Yerba mate

A move discussion has started again on the article: Talk:Yerba mate#Requested move: ? Ilex paraguariensis. I am notifying you since you expressed an opinion in the topic in the past. --Walter Görlitz (talk) 04:55, 14 July 2012 (UTC)

Talk:Mate (beverage)

A move discussion has started again on the article: Talk:Mate (beverage)#Requested Move: ? Maté. I am notifying you since you expressed an opinion in the topic in the past. --Walter Görlitz (talk) 04:59, 14 July 2012 (UTC)

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Firoozbakht's conjecture

Please explain at the article talk page why you are attempting to reinstate this material. Repeatedly reinserting this material without discussion or explanation, and against a consensus achieved at the talk page, is Wikipedia:Edit warring. Deltahedron (talk) 06:35, 16 May 2014 (UTC)

This is scarcely an adequate statement. You ignored the discussion, and incorrectly assert that User:Reddwarf2956 is an SPA, when that is patently untrue, and constitutes a personal attack. Merely repeating assertions without addressing the points made in the previous discussion is not a way to resolve a dispute. Please do not simply reinsert this material without adequate discussion leading to a consensus in its favour or it will be necessary to seek to have your editing restricted. If you wish to discuss the material you wish to insert, please do so at the article talk page: the discussion here on your talk page is about your behaviour. Deltahedron (talk) 17:11, 16 May 2014 (UTC)

I wasn't aware of any discussion. I still don't see anything -- perhaps somewhere above, mixed in with other topics?

Further, I haven't seen any justification for the removal of the sourced material here. Should I take this to WP:DRN, or shall we discuss it here?

CRGreathouse (t | c) 07:01, 18 May 2014 (UTC)

It seems hard to believe you have not seen this in which I explain the problems with your proposed material.

You need to obtain consensus before inserting this. Please revert this yourself and show willing to discuss the issues at the article talk page. Your constant reinsertion of the same text against consensus and without discussion is clear edit warring. Deltahedron (talk) 07:07, 18 May 2014 (UTC)

I hadn't, thanks for the pointer. I'll respond there. - CRGreathouse (t | c) 07:12, 18 May 2014 (UTC)

In future, read the article talk page and achieve consensus before inserting this material. If you reinstate this material in its present form without addressing the issues raised at the talk page and achieving consensus there, the next stop is Wikipedia:Administrators' noticeboard/Edit warring. Deltahedron (talk) 09:18, 18 May 2014 (UTC)

Ping

Your input is requested at WT:WPM#Draft:Reckless Xi function. Sławomir Biały (talk) 00:37, 14 November 2014 (UTC)

Happenings at Jevons paradox

I've recently done some revamping at Jevons paradox and would appreciate it if you had a look. Also, someone has apparently taken umbrage that the article doesn't declare that Jevons paradox dooms us all and there's nothing we can do about it, and has nominated the article for GA reassessment. As a co-sponsor of the original GA, it would be great if you could comment.[7] Best, LK (talk) 11:56, 29 May 2015 (UTC)

See my Talk message to Temeku here: [8]. - CRGreathouse (t | c) 14:54, 1 June 2015 (UTC)

Much thanks for your prompt action. LK (talk) 03:29, 5 June 2015 (UTC)

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Long time

It's been nearly 8 years since our paths paths have crossed on Wikipedia. I knew that the day I'd check back in, I'd see what I have now seen. Eight long years... that's literally as long as med school and residency, which for a math guy, eight years is length of time usually required to enact and complete the transformation function for elements of the set "matriculants" and assigns them at a fairly high rate to the set "successful independent physicians" and if my mathematical bona fides appear a bit clunky or contrived, then maybe it is by design or maybe it is not. The world will not end in either case, fortunately. Either way, our paths have merely crossed; but, I have for so long anticipated what this feeling would feel like, that my words might resonate an undeniable familiarity. If nothing else, may these words find you in good fortune and may the common bond of curiosity amongst our mathematically-minded brethren be the same today as it is in our past, present, and future.

Keep up the good work! But, let one final, modest tone of wisdom emanate from from my fingertips into cyberspace where they may be imprinted onto the fine, cuneiform tablets forming the foundational backbone of the internet: The chains of habit are too light to be felt until they're too heavy to be broken. Interpret these 17 words not for their literal meaning -- but for what they would mean if I were to have written exactly what you needed to have read. Then once you find meaning to what I were to have written, use my words in whichever way you see fit and in whichever way you choose to use them. Being the only person (that I know of) that has such powerful abilities to use written language beyond the scope of how the inventors of language and words ever foreseeably intended, I of course live a very unique and quaint life on a sequestered island in an endless sea of desolation from the world in which I concomitantly keep at arm's length. Godspeed, Adwctamia (talk) 03:14, 21 November 2016 (UTC)

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OEIS

Are you Charles R Greathouse IV on OEIS? I am Bobby Jacobs. I contributed a lot of sequences on OEIS. Now, I am contributing to Wikipedia. Bobby Jacobs (talk) 19:38, 17 February 2017 (UTC)

I am, welcome to Wikipedia Bobby. I primarily contribute on the OEIS but I am also an administrator on the English Wikipedia. - CRGreathouse (t | c) 04:56, 18 February 2017 (UTC)

On this day, 11 years ago...

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Number articles

Your input is requested at WT:WPM#Edits to number articles, since you are our resident expert on obscure properties of numbers.  :-) Sławomir Biały (talk) 19:53, 16 May 2017 (UTC)

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Why have I received this message? All administrators are receiving it. What prompted you to send this message? Recently, several Wikipedia admin accounts were compromised. The admin accounts were desysopped on an emergency basis. In the past, the Committee often resysopped admin accounts as a matter of course once the admin was back in control of their account. The committee has updated its guidelines. Admins may now be required to undergo a fresh Request for Adminship (RfA) after losing control of their account. What do I need to do? Only to follow the instructions in this message. Check that your password is unique (not reused across sites). Check that your password is strong (not simple or guessable). Enable Two-factor authentication (2FA), if you can, to create a second hurdle for attackers. How can I find out more about two-factor authentication (2FA)? You can find out more about 2FA at m:2FA.

This message was sent to all administrators following a recent motion. Thank you for your attention. For the Arbitration Committee, Cameron11598 02:34, 4 May 2019 (UTC)

Administrator account security (Correction to Arbcom 2019 special circular)

ArbCom would like to apologise and correct our previous mass message in light of the response from the community.

Since November 2018, six administrator accounts have been compromised and temporarily desysopped. In an effort to help improve account security, our intention was to remind administrators of existing policies on account security — that they are required to "have strong passwords and follow appropriate personal security practices." We have updated our procedures to ensure that we enforce these policies more strictly in the future. The policies themselves have not changed. In particular, two-factor authentication remains an optional means of adding extra security to your account. The choice not to enable 2FA will not be considered when deciding to restore sysop privileges to administrator accounts that were compromised.

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For the Arbitration Committee, -Cameron11598 21:03, 4 May 2019 (UTC)

CfD nomination of Category:Profession user templates

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Nomination for deletion of Template:Math-citation

Template:Math-citation has been nominated for deletion. You are invited to comment on the discussion at the entry on the Templates for discussion page. Izno (talk) 06:00, 27 January 2021 (UTC)

context-setting

I changed it from this so that it says "In an area of mathematics called differential topology". Writing "In differential topology" fails to tell the lay reader that mathematics is the field within which this topic exists. Michael Hardy (talk) 20:27, 31 July 2021 (UTC)

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OPNs- That time again

Since you asked me to ping you if this COI issue came up on the perfect number article, again, pinging you about Talk:Perfect_number#Addition_for_the_odd_perfect_number_and_COI-_(III?). JoshuaZ (talk) 12:40, 6 December 2021 (UTC)

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Happy Adminship Anniversary!

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Ceres

Hi. Nice, clear source you added. However, at 1 Ceres we have one from a couple years later that we summarize as saying Ceres "is at least close to being in hydrostatic equilibrium, though some deviations from an equilibrium shape have yet to be explained." That's why we didn't include Ceres with Pluto as confirmed to be in HE. Are we perhaps misreading the 2018 pub? — kwami (talk) 18:16, 12 September 2022 (UTC)

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Betz law and steam turbines

In https://en.wikipedia.org/w/index.php?title=Watt&diff=1125015620&oldid=1124791454 you've pointed at Betz law when explaining the difference between thermal and mechanical/electrical output of a steam powerplant. I think that's wrong, because Betz law only applies to turbines that operate on incompressible flows. This is not a correct assumption for steam flow in a steam turbine (the reason it's a valid assumption for air in an wind turbine is that the relative pressure drop across the turbine is negligible there, but is very much non-negligible in turbine setups intended to extract energy from steam while expanding it more than hundredfold). Robryk (talk) 02:07, 16 December 2022 (UTC)

I added the link for comparison, but I see your point about incompressibility. But if we remove the link entirely, there's no discussion of efficiency at all, nor any sense of what the 30% efficiency of this setup means. Do you have a suggestion for wording or a link which would serve our readers better? - CRGreathouse (t | c) 02:47, 16 December 2022 (UTC)

I would rather point at https://en.wikipedia.org/wiki/Carnot%27s_theorem_(thermodynamics), which does apply to anything that produces mechanical (or any zero-entropy) power from thermal power, regardless of mechanism. Robryk (talk) 03:45, 16 December 2022 (UTC)

In fact there's a school of thought where one should report efficiencies of heat engines (devices that convert thermal power to mechanical power) so that 100% is the limit that Carnot's theorem stipulates. I'm in a bit of a rush, so can't find references for that right now. Robryk (talk) 03:50, 16 December 2022 (UTC)

For the sake of precision: the thing that matters for Betz's law is density change, and a flow can change its density due to pressure or temperature change (or, as is usually the case, both -- expansion is turbines is closer to adiabatic than isothermal). Robryk (talk) 03:48, 16 December 2022 (UTC)

Carnot's theorem sounds perfect. Thanks for improving the article! - CRGreathouse (t | c) 20:23, 16 December 2022 (UTC)

Happy Fourteenth Adminship Anniversary!

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