# User talk:Wcherowi

## Spaces

Hi Wcherowi. I reverted the reversion you did on the Space (mathematics) article. The content I added was content for the encyclopedia page, not discussion for the talk page. Please feel free to edit it to make the text fit with Wikipedia's encyclopedia style. --Hierarchivist (talk) 05:25, 7 March 2013 (UTC)

Hi Bill, thanks so much for your clarification on my talk page. I folded my comment into the article under measurable spaces. The main point I wanted to make was that not all topological spaces are measurable. How I'd written it came off as a justification of my initial comment about the image, which I've now discarded. The statement about a slick proof is probably not encyclopedic, so feel free to rearrange that into a reference. Cheers! --Hierarchivist (talk) 06:28, 7 March 2013 (UTC)

## Your article has been moved to AfC space

Hi! I would like to inform you that the Articles for Creation submission which was previously located here: User:Wcherowi/Projective planes has been moved to Wikipedia talk:Articles for creation/Projective planes, this move was made automatically and doesn't affect your article, if you have any questions please ask on my talk page! Have a nice day. ArticlesForCreationBot (talk) 04:21, 17 October 2011 (UTC)

## Your submission at Articles for creation

You recently made a submission to Articles for Creation. Your article has been reviewed and because some issues were found, it could not be accepted in its current form; it is now located at Wikipedia talk:Articles for creation/Projective planes. Please view your submission to see the comments left by the reviewer. Feel free to edit the submission to address the issues raised, and resubmit once you feel they have been resolved. (You can do this by adding the text {{subst:AFC submission/submit}} to the top of the article.) Thank you for your contributions to Wikipedia! Chiswick Chap (talk) 16:05, 17 October 2011 (UTC)

## Welcome

Hello, Wcherowi, and welcome to Wikipedia! Thank you for your contributions. I hope you like the place and decide to stay.

I'm sorry you've had such a run-around with the projective plane page. You've picked up a lot of Wikipedia's often mysterious ways of working very well, but obviously not all of them yet! I think we are getting there, if not let me know how I can help, see below

Here are some pages (from the normal welcome script) that you might still find generally helpful:

I hope you enjoy editing here and being a Wikipedian! Please sign your messages on discussion pages using four tildes (~~~~); this will automatically insert your username and the date. If you need help, check out Wikipedia:Questions, ask me on my talk page, or ask your question on this page and then place {{help me}} before the question. Again, welcome! Andrewa (talk) 14:06, 18 October 2011 (UTC)

{{help me}}:Thank you Andrew. I would certainly like to get this Projective plane page untangled. I realize that it will take an administrator, such as yourself, to carry out the move that I have asked for. My only question at this point in the process is the following: During a lapse of judgement on my part I actually followed someone's advice and sent the article to AfC, where it now happily resides. My second request for a move now looks like I am asking for a redirect to replace the original article. What I would like to know is whether or not I should move my article back to my sandbox or just leave it where it is, hoping that whoever works on this will understand my intent and do the right thing? Is there anything else that I should do to make the process easier? Thanks again. Bill Cherowitzo (talk) 17:05, 18 October 2011 (UTC)

I've now seen your other posts with suggestion to just cut-and-paste. I'm fine with that. I thought that I was going about this the right way, but I must have missed a bump in the learning curve. I'll withdraw my request for a move. The above question is now moot, but I'd like an answer just for my own edification.Bill Cherowitzo (talk) 17:54, 18 October 2011 (UTC)

I think I see the whole picture (note a helpme won't always bring back the same person that replied before!). I see a few choices (I think)...
1. Move the page back to User:Wcherowi/Projective planes - you should be able to do that as there is only a simple redirect with no history. You may also ask an admin to delete the redirect left at Wikipedia talk:Articles for creation/Projective planes - or ask an admin to do both (leave me a note on my talk, if no one about)
2. You can ask for other editor feedback at any time (without moving the page) at WP:RFF
3. When you are happy with the new page - check no one has edited the original and added something you might overwrite! - then you can cut and paste your sandbox into the original in one hit (this is probably the only use for cut and paste on WP - as all the edits are by a single editor - the edited article will only show one edit by your self, not the 40 or so you have done), OR you may ask an admin to do a history merge (leaving out the AfC edits) with the original page - in a nutshell the main page is deleted, your page moves to the article name, and then all the deleted history is restored, given one long history.
Hope that makes some sense.  Ronhjones  (Talk) 18:50, 18 October 2011 (UTC)
It all makes good sense to me, thanks for putting it so clearly. I have cut to the chase and done the move back to user space, and have not created a redirect.
The reason that cut-and-paste moves to the article space are discouraged, even forbidden in most cases, is that we need to preserve the history of edits others have made, in order to associate the edits with the authors. That's a condition of the copyleft licences we use, both the GFDL which we still use for historical reasons and the Creative Commons licence we now prefer. If the changes you're making to the article are all your own, this is not a problem.
The other place I can think of that cut-and-paste is sometimes needed is in performing article splits and merges, but those topics don't concern us here. Andrewa (talk) 20:01, 18 October 2011 (UTC)
Would you like me to now formally close the move request? Normally this should be done by an uninvolved admin, but I'd be quite happy to do it in this case at your request, under our policy of WP:IAR, see also WP:SNOW. Andrewa (talk) 20:11, 18 October 2011 (UTC)
I would appreciate your formally closing the move request. Thanks again for getting involved in this. Bill Cherowitzo (talk) 21:39, 18 October 2011 (UTC)
Done. Andrewa (talk) 00:40, 19 October 2011 (UTC)

My apologies for not taking a closer look at this the first time around. If I had seen exactly what was going on, I could have saved you a lot of grief. I look forward to working with you, and hope that next time I'll be helpful rather than a hindrance. Cliff (talk) 06:09, 27 October 2011 (UTC)

Thank you Cliff. I'll chalk this up to one of life's little lessons: If you don't go through any rough patches, you'll never learn how to deal with them. I'm sure that things will go a bit smoother in the future.Bill Cherowitzo (talk) 23:53, 27 October 2011 (UTC)

## Geometry

Apparently you do not know how protection works. See WP:PP. I am just doing maintenence edits. LikeLakers2 (talk | Sign my guestbook!) 19:45, 3 December 2011 (UTC)

## Talkback

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## Combinatorial Species

hello. I have seen you have modified my contribution to the Fano's plane.

I have added the combinatorial description, uses the language defined here Combinatorial species - yes I know - it needs some exercise to read the combinatorial equations.

This one is a very short equation, that contains two derivations and a product and, for sure, deserved to be mentioned.

Pls. put back my contribution. Thank you. Best Regards Nicolae Nicolae-boicu (talk) 17:59, 4 July 2012 (UTC)

this one wcherovy : Fano"=X.Klein. Nicolae-boicu (talk) 21:31, 27 July 2012 (UTC)

dear Bill

I have taken my time to think at your "combinatorial interpretation" - What I have understood, is that right now, nearby "geometrical interpretation" or "physical interpretation" (the small infinits calculus) there is one more. It seems that I will have to live with it. The fact is right now I have no ideea how to deal with "copies". What color would have the intersection of a "green set" with a "red set" ? which is the sum of a "yellow 2" and a "pink 3" ?

Thank you for your intervention and - promised - if one day the wonderful ideea how to deal with "copies" will come to me, I will leave you a message.

you still don't believe me ? there is stuff that works by "cancellation", like math. And there is stuff that works by "ignoration", like the interpretation. Can't trisect an angle ? so what ? the magic is still there ! Nicolae-boicu (talk) 19:25, 31 August 2012 (UTC)

## TUSC token 59513e5919c9a01df897ae05eddf7914

I am now proud owner of a TUSC account!

    Transformation in time.
I like your boldness.Three hours to read, understand new knowledge is not enough. I suggest read again, think and then answer. The equation is not distorted in the 'editing'. Cosmology csn be difficult so ask questions if you want to know more. KK (83.26.192.45 (talk) 07:21, 23 July 2012 (UTC))


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Hi, I've noticed that you are doing a lot of nice work on the disambiguation of links: well done! :-D Daniele.tampieri (talk) 07:08, 9 December 2012 (UTC)

## Hand-coding

Hey all :).

I'm dropping you a note because you've been involved in dealing with feedback from the Article Feedback Tool. To get a better handle on the overall quality of comments now that the tool has become a more established part of the reader experience, we're undertaking a round of hand coding - basically, taking a sample of feedback and marking each piece as inappropriate, helpful, so on - and would like anyone interested in improving the tool to participate :).

You can code as many or as few pieces of feedback as you want: this page should explain how to use the system, and there is a demo here. Once you're comfortable with the task, just drop me an email at okeyeswikimedia.org and I'll set you up with an account :).

If you'd like to chat with us about the research, or want live tutoring on the software, there will be an office hours session on Monday 17 December at 23:00 UTC in #wikimedia-officeconnect. Hope to see some of you there! Thanks, Okeyes (WMF) (talk) 23:13, 14 December 2012 (UTC)

## Intersecting conics examples

Hi Bill,

I think I got it worked out. I added a note with a link to the location of two worked out examples here:

http://en.wikipedia.org/wiki/Talk:Conic_section#Example_of_intersecting_two_conics

The only thing I don't understand is why there are 3 solutions to the degenerate conic, but only 1 is necessary to solve for the intersections.

daviddoria (talk) 20:46, 28 February 2013 (UTC)

Hm, but we get two lines from a single degenerate conic, and it seems that this is all that is necessary (I only used $\mu=-1$ and I got both lines that I needed, no? daviddoria (talk) 21:01, 28 February 2013 (UTC)

Oh, so the intersection of the degenerate conics is the solution to the original problem (find the intersection of the conics)? It seems in the two examples I've worked out that the intersection of one of the degenerate conics with the original conics themselves also gives the intersections I am looking for? Is this not the case in general? daviddoria (talk) 16:53, 4 March 2013 (UTC)

Ah, it all makes sense now. Thank you for your help! daviddoria (talk) 19:40, 4 March 2013 (UTC)

## Reverts on Line (geometry), Plane (geometry), Point (geometry)

Hi there, I disagree with your reverts for the following reasons:

• The article Mathematical object states these are mathematical objects,
• All Mathematical objects are abstract concepts of mathematics, hence mathematical concepts.
• My edits involved the addition of a category that is more specific, and the removal of a parent category, such that no information was lost.

You stated the revert was because the pages are about concepts and not objects, can you source this?

Thanks Bg9989 (talk) 15:39, 6 March 2013 (UTC)

I also noticed you marked your reverts as minor edits, which is a misuse of this tag see: Help:Minor edit Bg9989 (talk) 15:41, 6 March 2013 (UTC)

I agree with your decision's if you believe the articles talk about these terms, as signifiers used in different contexts - as opposed to abstract objects with conceptual framework manifesting in different mathematical forms.

## Article Feedback deployment

Hey Wcherowi; I'm dropping you this note because you've used the article feedback tool in the last month or so. On Thursday and Friday the tool will be down for a major deployment; it should be up by Saturday, failing anything going wrong, and by Monday if something does :). Thanks, Okeyes (WMF) (talk) 22:47, 13 March 2013 (UTC)

Sorry, my drawing was a bit confusing, since I wrote "P" in a wrong place: it is actually P_x', and "P" is the point from which there are perpendiculars drawn towards all the axes. But anyway, getting back to your explanation. When you rotate coordinate system conterclockwise, your angle between positive x-axis actually becomes smaller, it is going to be (ψ - θ). The angle is going to be (ψ + θ) if your rotation is clockwise. So, the formula in the article is given for clockwise rotation. Liartar (talk) 20:17, 16 March 2013 (UTC)

Thank you so much for explaining me my confusion. Now I see my mistake: I did not realize that the section is talking about rotation of an object, which is equivalent to rotation of coordinate system in opposite direction. Thanks again, and sorry for the huss. Liartar (talk) 14:32, 17 March 2013 (UTC)

## Inclusion–exclusion principle

Thanks for clarifying and improving my recent edits. Regards, Ijon Tichy x2 (talk) 19:18, 30 March 2013 (UTC)

## infinity: "size" vs. "number of points" in Dedekind infinity diagram

Thanks again for correcting my explanatory text on the Dedekind infinity diagram in the Infinity#Set_theory article! I was unhappy with the term "number of points", too, as it is not a precise mathematical notion when dealing with infinite sets (that's why I had put it in quotes). However, I thought it may be ok as an informal explanation for cardinality. On the other hand, your suggestion size could be understood by non-mathematicians as length of the line (e.g. in centimeters), which would be rather misleading. — Preceding unsigned comment added by Jochen Burghardt (talkcontribs) 17:43, 7 June 2013 (UTC)

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## Functional notation

FYI, the content at functional notation (which you just PRODed) was not mine. I merely moved it out of the unrelated article functional (mathematics) (as indicated in my edit summary). The user that originally added the content is Reddi , to whom the copyvio warning should obviously go, and who, I should add, is already the subject of a related inquiry of my own at WT:WPM#Conservative vector field. I appreciate your vigilance in this matter, although it magnifies my worries about User:Reddi (an established editor of more than 50,000 contributions). I fear a Jaggedesque scenario might soon be on the horizon. Best, Sławomir Biały (talk) 22:29, 30 August 2013 (UTC)

I should add that the text, although clearly plagiarized word-for-word without WP:INTEXT attribution, does not appear to be copyrighted (see, e.g., the publication date). This mitigates my concerns about the user in question only slightly, however. I have not removed the PROD from the article, although I think it is probably no longer a candidate for proposed deletion under the precise rationale that you gave. Sławomir Biały (talk) 22:41, 30 August 2013 (UTC)

My apologies for that ... I was aghast when I saw that Twinkle sent you the notice (I should have checked before PRODing). As to the copyright issue, it is clear that no violation can be claimed against the original source, but I was looking at Google's terms of service legalese and couldn't quite tell if this was covered under that umbrella. So I just tossed it out there hoping that some of our CV sleuths would work it out. I share your concerns about User:Reddi and will keep my eyes open for other instances. Bill Cherowitzo (talk) 22:56, 30 August 2013 (UTC)

No apology is necessary. Thanks again for catching this. Sławomir Biały (talk) 23:01, 30 August 2013 (UTC)

## Projective geometry

My apologies for my incorrect edits at Foundations of geometry. On checking I find that you are entirely correct. Projective geometry "modifies" Euclid's parallel postulate by simply dropping it altogether. I had always assumed this classified it as non-Euclidean in the same sense as the hyperbolic and elliptic varieties. My mistake. — Cheers, Steelpillow (Talk) 10:48, 17 September 2013 (UTC)

## Not a Funny Joke - Magic Squares

My edit to Magic Squares article was not a "Funny Joke" https://en.wikipedia.org/w/index.php?title=Magic_square&oldid=579884727 References is now added: https://en.wikipedia.org/w/index.php?title=Magic_square&oldid=579886504

Regards TraxPlayer (talk) 16:40, 2 November 2013 (UTC)

## De Morgan and circle squaring

I just saw your addition to Squaring the circle; I don't think it is quite accurate to say that De Morgan was "debunking" circle squaring in the Budget of Paradoxes. In the Budget, he does "review" many publications relating to circle squaring, and in a handful of cases he discusses what is wrong with the argument presented, but most of the time he simply says that it must be wrong and makes fun of the authors and their complaints when their work is ignored by mathematicians. But the debunking is very limited, and he does not present an argument for why the problem is unsolvable (he only has an appendix proving the pi is irrational). I don't want to get into an editor war or big discussion about it, but I do wonder whether "debunking" is an appropriate way to describe what De Morgan does in that book. Magidin (talk) 20:21, 14 December 2013 (UTC)

Re: 'ridiculing'... while more accurate, perhaps it would be better to simply say that the Budget is one of the most famous compendia/catalogue of attempted circle-squaring that appeared since the invention of the printing press. Magidin (talk) 05:10, 15 December 2013 (UTC)
Fair enough. I did think "debunking" gave the wrong impression, but I'm willing to go along with your current wording. Magidin (talk) 05:39, 15 December 2013 (UTC)

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## Pappus hexagon theorem article

Hi Wcherowi. I see you recently made an edit at Pappus's hexagon theorem. I've put a remark on the Talk page to the effect that the diagram shows a special case of the theorem and suggest the article should be amended to clarify this. Specifically the Pappus line is not in general concurrent with the lines formed by the two sets of triads. A Sextet Short of PG(2,57) (talk) 14:24, 27 January 2014 (UTC)

## Vertical line test

Why did you revert the edit? In what way do you think the notation is poor? It is the same notation as in Function_(mathematics)--Biggerj1 (talk) 21:10, 31 January 2014 (UTC)

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## Approximations of Pi

That editor has been warned twice before (me and another editor) for similar edits. Dougweller (talk) 17:13, 19 February 2014 (UTC)

Thanks for the heads up. Bill Cherowitzo (talk) 17:33, 19 February 2014 (UTC)

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## So-called "Tongue in cheek reference"

You removed the reference to a MacTutor History of Mathematics publications in the Wikipedia session on the Fibonacci number. This article was refereed and published. It was published online! TonyMath (talk) 01:32, 21 March 2014 (UTC)

## Field trace

Hi. Thank you for your recent edits. Yes, you're right. I was misreading the earlier definition to indicate the "closure operation" results in something in X. Without that, though, there is no guarantee a set can be closed, which makes the operation incompletely defined. But I agree, that's not always relevant. On the other hand it is often is very much desired. Perhaps the distinction can be noted somehow? Daren Cline (talk) 16:36, 25 April 2014 (UTC)

## Function (mathematics)

I've been either a college student or a college teacher for more than fifty years, and while I have seen the phrase "natural number" used to include zero, most notably by Peano (though I don't know what the phrase is in Italian), the blackboard N almost always does not include zero -- I can't think of an exception. But, I agree we need to be clear. I did not notice the N when I made my edit. I'm glad you caught that. I'll take another look, at order of operations, natural number, and factorial. Rick Norwood (talk) 21:26, 27 April 2014 (UTC)

## Permutation figures

Continuing our "discussion" (as you've generously put it) from David's talk page. I've contributed this image Wikimedia commons - Permutations to Permutation. I'm interested to hear whether you find it "wrong". it is different from the figure featured on Permutation Graph Larkin2 (talk) 19:19, 29 April 2014 (UTC)

I have looked at this image when you put it into the page. It depicts the repeated application of the permutation (1 2 5)(3 4) in cyclic notation or 25431 in one-line notation. It is not "incorrect", but it doesn't have much of a point. Similar diagrams are used by bell ringers who ring the changes to keep track of when each bell is to be rung. I don't know why you decided to put it into a section on cyclic notation, it doesn't seem to say anything about that style of notation. I thought about moving it elsewhere, but couldn't find a place where it naturally fit in, so I left it alone.Bill Cherowitzo (talk) 03:35, 30 April 2014 (UTC)
It "doesn't have much of a point"? really? My intention was to help visualize cycles by clealry showing the orbits, that they are disjoint, cyclic and that each element scans over all elements in the cycle. I was quite pleased with how many group theory concepts can be illustrated using that diagram and hoped it be useful in other contexts. But maybe it's "pointless" as you say. Wikipedia is not for me, I can't stomach the ubiquitous overtones of entitlement. Do what you will. Larkin2 (talk) 09:41, 30 April 2014 (UTC)
I am sorry you feel that way. I was in the process of working on a way to add text that would make the illustration meaningful in that section - in accordance with your vision of what this was meant to show, when I noticed that this wasn't the permutation I thought it was. In fact it is the inverse of the permutation I mentioned above, namely (1 5 2)(3 4) or 51432. (The diagram is not incorrect, just the caption.) I will go ahead with this, but it will take a little longer since I would now need to change other things in the article for consistency. Bill Cherowitzo (talk) 17:57, 30 April 2014 (UTC)

## May 2014

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## Warning Templates

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## June 2014

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• any set of non-orthogonal equiangular lines in a euclidean space can give rise to a two-graph (see [[equiangular lines]] for the construction}.<ref>{{harvnb|van Lint|Seidel|1966}}</ref>

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## Thanks for pointing out my error

Thank you for noting that I was confusing the connected-unconnected vertex language with the colored-edge-on-complete-graph language! I made a similar edit elsewhere in the article before reading your note, then reverted that too!

But now I am thinking that the equivalence of the "colored" vs "connected" presentations should be mentioned near the beginning of the article, since the introduction mentions only coloring, not connecting. I realize the equivalence is a pretty trivial thing to understand, but, as you saw, it did confuse me. I have refrained from making that addition to the introduction, just in case I am somehow wrong about this too! But what harm could it do to point out the equivalence? Dratman (talk) 20:45, 3 July 2014 (UTC)

Sometimes you get so involved with something that you can't see the forest because of all the trees! This has certainly happened to me a number of times and I am sure that it will happen again. I think you are right about putting the equivalence into the article – I'll take care of it. Bill Cherowitzo (talk) 18:30, 4 July 2014 (UTC)

## Divisibility rule: Thanks!

Gees, I made such a grade-school mistake .. Thank you for pointing out! Besides that, I'm adding "divisibility by 9" now; you can oversee it if you want. --SzMithrandir (talk) 15:07, 6 July 2014 (UTC)