Talk:Magic square

message: The tag for superscripts is  which is closed with 
The tag for subscripts is (similarly) - sub — Preceding unsigned comment added by Marj Tiefert (talk • contribs) 16:19, 16 May 2002 (UTC)
thread_title: Initial text

message: Provided your definition of a magic square is just that the columns,
rows and long diagonals have the same sum, then the magic squares with real
entries do form a vector space over R.
For n = 2, the dimension is 1, because all the entries must be equal.
For n = 3, the dimension is 3, because you can choose the first row
freely, but this then determines all the remaining entries.
The following three matrices form a basis:
 / 3  0  0 \      / 0  3  0 \      / 0  0  3 \
 |-2  1  4 |      | 1  1  1 |      | 4  1 -2 |
 \ 2  2 -1 /      \ 2 -1  2 /      \-1  2  2 /
I don't know how to determine the dimension in general, although it must
be at least n2-2n-1 and no more than n2.
--Zundark 14:51 Sep 13, 2002 (UTC)
The dimension is well known to be n2-2n-1. Zaslav 03:17, 23 January 2006 (UTC)
replies: text: Actually, it's n2-2n  The math works out this way, and I can give bases for the 3x3 and 4x4 vector space (of size 3 and 8 resp.) --128.61.115.86 (talk) 05:11, 24 April 2009 (UTC)
replies: text: Figured out the confusion: the well-known result (the extra minus one) is WITH the restriction to the first consecutive n2 integers.  This restriction fixes the magic number, reducing the number of unknowns by one, but it also destroys the vector spaceness of the set.  —Preceding unsigned comment added by Quintopia (talk • contribs) 18:04, 24 April 2009 (UTC)
thread_title:  To SJK: 

message: Isn't there a legend that the Loh-Shu magic square was first seen written on the shell of a turtle? -- Tarquin 21:34 Feb 1, 2003 (UTC)
:See  Cheers Chas zzz brown 07:59 Feb 2, 2003 (UTC)
:See Lo Shu Square. —Herbee 17:53, 20 Mar 2005 (UTC)
replies: text: Euler showed how to derive magic squares from Latin squares.
—Herbee 18:01, 20 Mar 2005 (UTC)
thread_title:  Loh-Shu magic square 

message: * Halló! I have some problems with the definition: Both according to Mathworld and to Harvey Heinz (this link should be included at #External links) the numbers start with 1 and end with n2.
* I would suggest that Wikipedia should use the same definition. To my understanding the "other" squares are somehow related or just simple "magic patterns".
* For analysis purposes more equivalent representations can be given: numbers from 0 to n2-1; odd numbers from -n2+1 to n2-1 and probably others.
* I developed a set of templates to be used to ilustrate many properties of 4x4 type magic squares at meta:Category:4x4 type square. Please let me know if you have some time to work on this subject and to help to make a wikibook at en: in other languages. We should make some documenation first and a list of items to work on. Thanks in advance! Best regards Gangleri | [ Th] | T 22:40, 28 July 2005 (UTC)
thread_title:  Definition 

message: * See: meta:User:Gangleri/tests/4x4 type square/generating magic squares with T000. Regards Gangleri | [ Th] | T 23:23, 28 July 2005 (UTC)
thread_title:  Yang Hui's square and "table of Jupiter" 

message: If anyone's interested, I just uploaded :Image:16th century arabic magic square.jpg.  Couldn't see an obvious place to add it, so I thought I'd just let you know.  — Laura Scudder ☎ 01:40, 10 February 2006 (UTC)
thread_title:  Historic image available 

message: Mr. Franklin was a great fan of magic squares, and created quite a few HUGE (16x16, 24x24) magic squares with a number of interesting attributes.
I also recall a magic square that had to do with the 365 days in our year. After a brief web search, I found on this site: http://www.jainmathemagics.com/page/1/default.asp that it says 
"This 27 x 27 Magic Square Calendar has, as its central cell, the number 365 which is the number of days in a solar year. It has 364 dark cells which represent the number of nights, and 365 white cells which represent the number of days. The Magic Sum of the inner and central 3x3 square is 1,095 being the number of days in a 3 year period. The Magic Sum of the 9x9 square is 3,285 being the number of days in a 9 year period. The Magic Sum of the whole 27x27 square is 9,855 being the number of days in a 27 year period."
I also recall a few other crazy interesting magic squares (http://mathworld.wolfram.com/PrimeMagicSquare.html is neat), and know that there have been some famous people (besides Franklin and Durer) that dabbled with/used magic squares.
If anyone wants to run with this idea to add a section on a list of famous people who played with magic squares or who wants to add a section talking about the many connections with various occultist/whatever things ... go ahead. Email me at cht13er a t gmaildotcom if you like :-) cheater 14:03, 15 March 2006 (UTC)
thread_title:  Ben Franklin and others 

message: Perhaps I have missed something, but aren't the first and second paragraphs of this section saying the same thing? Bio 18:08, 22 November 2006 (UTC)
thread_title:  Magic Squares of odd order 

message: I saw this site on smagic quares and I think the construction of magic squares there is easier. Can someone investigate this? --Blonkm 02:38, 17 December 2006 (UTC)
thread_title:  Source of info 

message: Islam is a religion, I think the part titled "Islam" should be renamed. It is about arabic uses of magic squares. It should be called "Arabs".
What about mid-eastern?  Yongke 17:09, 11 March 2007 (UTC)
thread_title:  Islam 

message: I moved 2 cube links to end, then added 3 hypercube links.Harvey Heinz 17:11, 12 September 2007 (UTC)
thread_title:  More "See also" 

message: In the section describing how to construct a magic square of odd order, the article posted two assertions about the properties of "Middle Number" and "Last Number", namely:
The "Middle Number" is always in the diagonal bottom left to top right.
The "Last Number" is always opposite the number 1 in an outside column or row.
Queries. Counterexample for a magic square of order 5:
3 	9 	12	20	21
17	25	1 	8 	14
6 	13	19	22	5
24	2 	10	11	18
15	16	23	4 	7
The "Middle Number" is 13, the "Last Number" is 25, but 13 (Middle Number) is not always in the diagonal bottom left to top right and 25 (Last Number) is not always opposite 1 in an outside column or row for an order 5 (odd order) magic square.
A very good site on magic square, where I found the counterexample from, is http://www.magic-squares.de/general/general.html.
In my opinion, an order n magic square must be a square array of natural numbers from 1 to n2 arranged in a way such that every row, every column, and the two diagonals all sum to a constant. Other so-called magic squares that do not fit to this definition are not considered "magical" and beautiful for me. But again, that's just my opinion.
By the way, this article is hard to follow and seriously needs a lot of decoration, the magic squares look horrible.
Wei Cheng (talk) 10:30, 14 June 2008 (UTC)
replies: text: The section is called "A method for constructing a magic square of odd order". The statements about the middle and last number only apply to magic squares constructed with that method. You are right that there exist other magic squares not having the same property. PrimeHunter (talk) 11:14, 14 June 2008 (UTC)
replies: text: Thank you, PrimeHunter, for pointing out my mistakes. I skimmed the article, so I didn't pay close attention to the wording. I would delete the formulae under that section since it is kind of trivial, insignificant and useless. We are already told an easy method of constructing odd order magic squares, so why bother with the more complicated formulae, which only help locate two numbers? Also, for the history of magic squares, why not just directly link from the Lo Shu Square article, with the pictorial graph of order 3 magic square rather than the modern representation? Wei Cheng (talk) 10:08, 15 June 2008 (UTC)
thread_title:  "Middle Number" and "Last Number" 

message: Here a nice animation of the Siamese method, which I guess could be used also in the main Magic square article. Cheers PHG (talk) 04:05, 19 August 2008 (UTC)
thread_title: Siamese method

message: I was combing the internet trying to find a method to make an arbitrary 3x3 magic square -- not a normalized one. Meaning the sum doesn't have to be 15. I remember in grade school there was a simple method they taught to do it, but I couldn't remember it.
I worked out the trick, or a method. In a 3x3 magic square the center is always 1/3 of the sum. Knowing that it's easy to make an arbitrary magic square. Just choose the top 3 numbers of the square and make sure the sum is a multiple of 3 greater than 15. Say
7 9 2
We know the center square is 6 since the sum is 18. From that you can work out the whole square easily.
792
1611
1035
Anyway I thought it would be a nice addition to the methods of construction, maybe someone wants to add it in.
David Ashley  —Preceding undated comment was added at 03:04, 8 November 2008 (UTC)
thread_title: Special Case for 3x3

message: I saw this "magic square" somewhere, what properties does it have?!? It's not magic!
 89 3 34
 8 21 55
 13 144 5
Professor M. Fiendish, Esq. 03:23, 13 September 2009 (UTC)
thread_title:  Read about this what properties does it have?!? 

message: FYI A New Interpretation of Odd Magic Squares in the Lo Shu format has been prodded now - see Wikipedia talk:WikiProject Mathematics#New article help‎. Rd232 talk 11:30, 19 September 2009 (UTC)
thread_title:  A New Interpretation of Odd Magic Squares in the Lo Shu format 

message: ‫·‏לערי ריינהארט‏·‏T‏·‏m‏:‏Th‏·‏T‏·‏email me‏·‏‬ 23:09, 22 October 2009 (UTC)
thread_title:  [[:file:2009.10.23 quaternion square 01.png]] 

message: Should http://Magic-squares.net be linked to this page?
Whie posted on Wikipedia's Magic Squares page, this discussion applies to all magic square catagory articles.
The powers-that-be think that this is a SPAM LINK.
but
* It is one of the oldest sites on magic squares on the Internet.(http://www.geocities.com/~harveyh before being forced to move in late October 2009). The new site URL is http://www.magic-squares.net/
* It is one of the largest, most comprhensive, and well researched sites on magic hypercubes on the Internet (over  70 MB in 4 interconnected sites).
* It contains extensive bibliographies, historical quotations and examples, statistics, a timeline, etc.
*It can supply much additional material and many visual examples in support of this article and the other articles in the Magic Squares catagory).
Links to the above site have now all been removed from all magic square catagory articles. Because of how quickly this happened after my posting, I must assume it was done without proper review. Is that fair? 
I do not wish to get into a discussion of which web sites are better.
But I do see existing links on these pages which clearly do not add to the material in the article at hand.
What do you think? --Harvey Heinz (talk) 23:56, 5 November 2009 (UTC)
replies: text:  Good site. Definitely not a spam link. Machine Elf 1735 (talk) 00:01, 1 January 2010 (UTC)
thread_title:  Is This a Spam Link?

message: I think that some of the information in this article is incorrect.
(1) There is no reference to magic squares of planets that I could find in either Agrippa's Three 
Books of Occult Philosophy or Magic or in Agrippa's Fourth Book of Occult Philosophy.
It appears that the information in the wiki article comes from a blog of Mark Swaney.
That is certainly not a primary source. If it is indeed from one of the Agrippa books,
then that book and the page numbers in the book should be referenced.
(2) The magic square given for the Sun is not the same as that given on page 395
in Budge's book Amulets and Superstitions, Oxford University Press, 1930.  —Preceding unsigned comment added by Haralick (talk • contribs) 05:37, 30 May 2010 (UTC)
thread_title:  incorrect information 

message: Added the reference Demirörs, Rafraf, and Tanik (1992). Scribbleink (talk) 22:40, 3 October 2010 (UTC)
thread_title:  More "references" 

message: For this magic square it could be noted that any combination of four numbers that exhibit a radial symmetry about the center add up to 34. In other words any four box locations that are in the same locations when the whole square is rotated 180 degrees or sometimes just 90 degrees will add up to 34. This is of course in addition to the other asymmetrical arrangements such as in columns, rows, and the three-square groupings' corners.  — Preceding unsigned comment added by Carlsez (talk • contribs) 17:31, 20 January 2011 (UTC)
thread_title:  Simplified explanation of Melancholia I magic square 

message: There is a connection between magic squares and cheating dice. For example, use the rows of a 3x3 square as sides of triangular dice A, B and C:
*A: 8, 1, 6
*B: 3, 5, 7
*C: 4, 9, 2
Each dice has the same total number of points.  But if you throw any pair of dice:
*A beats B 5 times out of 9.
*B beats C 5 times out of 9.
*C beats A 5 times out of 9.
I have not investigated whether this is true of all additive squares.
nrp@dog-days.co.uk  —Preceding unsigned comment added by 87.112.8.225 (talk) 11:30, 16 March 2011 (UTC)
thread_title:  Cheating dice 

message: I am not sure if Magic Squares should be in the "Unsolved problems in Mathematics" category. 
Bande-Ali (talk) 06:08, 27 June 2011 (UTC)
thread_title:  Unsolved problems in Mathematics? 

message: The section on the first 5 and 6 order squares is repeated literally. make choice on where to delete 145.100.125.133 (talk) 07:00, 6 December 2011 (UTC)
thread_title:  Repetition 

message: Besides magic squares of primes, there is a longstanding unsolved problem relating a 3x3 magic square of perfect squares. The case 4x4 was solved by Euler in 1770. But please refer to http://www.multimagie.com/English/SquaresOfSquares.htm for more magic square of squares examples.
Also note that http://www.multimagie.com/English/Records.htm shows a table of known multimagic squares, where a square with entries {s(a,b) with 1 <= a,b <= k} is n-multimagic if each square formed by {s(a,b)^i with 1 <= a,b <= k} is magic, for i = 1, ..., n.
Bcurfs (talk) 00:55, 4 June 2012 (UTC)
thread_title:  Related problems 

message: The page Simple magic square appears in WP:DUSTY and hasn't been edited since 2007 and is unreferenced. What do people think should happen to the article?--Salix (talk): 15:36, 30 September 2012 (UTC)
replies: text: I would say that a merge is in order, with perhaps a slightly higher (earlier in the article) introduction of pandiagonal magic squares. The "simple" adjective doesn't add anything and I've never seen it used (but I am no authority on the subject). Bill Cherowitzo  (talk) 17:30, 30 September 2012 (UTC)
thread_title:  Simple magic square 

message: I managed to calculate the number of 1x1, 2x2, ..., 5x5, etc. size magic squares. I believe that the number of 5x5 is incorrectly posted as 275,305,224. It should be 275,305,810 according to my formulas. If you'd like see the solutions, then please visit my website... www.oddperfectnumbers.com. I'm not trying to break any guidelines, just provide you with the correct answer.99.142.32.118 (talk) 18:07, 16 November 2012 (UTC)
replies: text: According to OEIS, the number of 5×5 magic squares was calculated by Rich Schroeppel, but they don't give a reference.  This suggests that the result is unpublished, and it's possible that Schroeppel made a mistake. Perhaps you could contact him and discuss it? —Mark Dominus (talk) 06:48, 17 November 2012 (UTC)
replies: text: You might also want to check a more recent (Schroeppel's work dates to 1973) article which provides a generating function for the number of magic squares. Beck, Cohen, Cuomo and Gribelyuk, The number of "magic" squares, cubes and hypercubes, Amer. Math Monthly 110(2003), 707-717. Bill Cherowitzo  (talk) 18:05, 17 November 2012 (UTC)
replies: text: Other computations agree with Rich Schroeppel. A Google search on  quickly found , , . I haven't found other reports of your number so I suspect you have an error. Thousands of sources mention the accepted count. Your alternative count should not be mentioned in the article without being accepted by a serious peer-reviewed math journal. PrimeHunter (talk) 01:38, 18 November 2012 (UTC)
replies: text:  oh, ok... if all the (programs) agree, then I should doubt my formulas. NO! They all share the same algorithm; I have sent an e-mail to Rich. They reason that I contest his (count) is because, for n=4, 880 has the factor of 11 as does my algebraic formula, and that 11 comes from my generator function "portion". Richard's (computation) does NOT contain the factor 149 which clearly has to be present, since it's in my generator function "portion" for n=5. Our answers are too close not to suppose that Richard's isn't correct and mine could be... I'm 4 for 4... N= 1, 0, 1, 880, and I hope that I'm 5 for 5... N= 275,305,810.99.142.44.250 (talk) 02:53, 18 November 2012 (UTC)
replies: text:  I finally did confirm that Richard's computation was correct. It turned out that when 'n' is odd, I have to subract ((n-d)^2)*2^n from my calculation where n= (order) and d= (dimension). we agree at 275, 305, 224. 99.142.24.207 (talk) 19:05, 3 March 2013 (UTC)
thread_title:  Number of magic squares 

message: The idea of using genetic algorithms to construct magic squares seems dubious, given that different solutions have unrelated arrangements of numbers. The page used as a reference certainly does not support the idea: I have not seen the java program it provides successfully generate a single 4x4 magic square! — Preceding unsigned comment added by Tyson Jacobs (talk • contribs) 07:40, 15 January 2013 (UTC)
thread_title:  Genetic Algorithms 

message: I stand by my good faith changes to the section here on medjig method, and would like to undo the revert by Arthur Rubin (see below).
My students here at Canisius College found the current discussion confusing, and helped me word my editing. Here is a summary:
 
The desired square is produced with entries x+9y, where x comes from an N x N square, and y comes from
the solution to a medjig puzzle.   Referring to "modulo" might be saying that once the desired square is produced, 
one can recover the x entries by working modulo 9.    But it is confusing not to point out that x and y entries must first be found, with the y then multiplied by 9.
18:43, 17 April 2013‎ Arthur Rubin (talk | contribs)‎ . . (56,941 bytes) (-13)‎ . . (Reverted good faith edits by 138.92.105.245 (talk): I'm not sure which explanation is more accurate (and/or sourced), but it is really is "modulo". (TW)) (undo)  — Preceding unsigned comment added by 138.92.105.245 (talk)  
:I'm still not sure which construction is more clear for the 6×6 square; I'm not qualified to do that, being a long-time mathematician.  However, it really is modulo N^2, rather than times N^2.  In fact, the latter is clearly wrong.  — Arthur Rubin  (talk) 18:58, 18 April 2013 (UTC)
thread_title: Modulo vs. times

message: When any kind of prime numbers are plotted (in this example) to 5x5 "quadrasquare", they seem to always exhibit even numbers as opposed to other numbers or integer series which give both even and odd numbers.
The example can be downloaded at http://www.2shared.com/document/NIVoia0b/Quadrasquares_with_primes_and_.html as PDF-file. It demonstrates how a "quadrasquare" is assembled. -VET  — Preceding unsigned comment added by 85.156.10.88 (talk) 13:24, 28 October 2014 (UTC)
thread_title:  Quadrasquares 

message: I changed the list of sub-squares to include the corners of 4x2 and 2x4 rectangles, and removed the two special cases that are actually included in the set of these rectangles. I'd appreciate it if someone could review my change to make sure it's appropriate. 50.240.201.161 (talk) 17:40, 18 April 2015 (UTC)
thread_title:  India 

message: In the Types and Construction section, it claims that it is impossible to construct a magic square of order 2.  I think it should say "normal magic square", since it's trivial to construct an order 2 magic square if duplicate numbers are allowed.  Based on this and other statements, such as those referring to the difficulty of construction, I suspect most or all of this section really means "normal magic square" whenever it says "magic square" but I don't have the expertise to fully correct this. Mnudelman (talk) 19:06, 25 April 2015 (UTC)
replies: text: Normal magic squares are those using the integers 1 to n^2. In any magic square, normal or not, the numbers have to be all different, so the statement that squares of order 2 are impossible is correct. 2.25.149.104 (talk) 14:59, 20 April 2016 (UTC)
thread_title:  Missing "normal" 

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thread_title:  External links modified 

message: Does anyone know when Franklin's magic square was published? I know that he constructed them around 1750 and privately communicated them in 1770s. But when did the world know about it? Manoguru (talk) 19:39, 15 December 2018 (UTC)
thread_title:  Date of publication of Benjamin Franklin's magic square

message: I will Do 8 if you Create 2023 i will Make you 2 2409:4056:282:67B6:2C27:4F65:A7DB:9DB6 (talk) 18:30, 17 July 2022 (UTC)
thread_title:  Governor 

message: The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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thread_title:  A Commons file used on this page or its Wikidata item has been nominated for deletion 

message: Hello. I don't intend to modify the tag, but I can't find the "This article may be too long to read and navigate comfortably" tag (at the head of the article) in the editor. How can I get at it? MultiScrivner (talk) 02:57, 9 October 2023 (UTC)
thread_title:  Help-Editing question