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Dragon Hellfire
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#Post#: 2--------------------------------------------------
Magic Polygons
DIR By: Dragon Hellfire
Date: March 10, 2019, 9:47 pm
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Magic Polygons on Wikipedia
HTML https://en.wikipedia.org/wiki/Magic_polygon
*These may be studied in higher dimensions, such as magic
hypercubes
*The most popular of these shapes is the Magic Square
HTML https://en.wikipedia.org/wiki/Magic_square
Definitions
Normal: The elements of the magic polygon are consecutive
integers starting at one.
Magic Square Parameters
N: The number of elements on a given axis
s: The 'magic number', equal to (N^3 + N)/2. This is the sum of
each row, column, and principle diagonal.
[table]
[tr]
[td]N[/td]
[td]s[/td]
[/tr]
[tr]
[td]1[/td]
[td]1[/td]
[/tr]
[tr]
[td]2[/td]
[td]5[/td]
[/tr]
[tr]
[td]3[/td]
[td]15[/td]
[/tr]
[tr]
[td]4[/td]
[td]34[/td]
[/tr]
[tr]
[td]5[/td]
[td]65[/td]
[/tr]
[tr]
[td]6[/td]
[td]111[/td]
[/tr]
[tr]
[td]7[/td]
[td]175[/td]
[/tr]
[tr]
[td]8[/td]
[td]260[/td]
[/tr]
[tr]
[td]9[/td]
[td]369[/td]
[/tr]
[/table]
History of Magic Squares
(1) First mentioned in a Chinese manuscript around 2200 B.C.
Thought to be independently developed and studied across
cultures (?)
(2) Albrecht Durer created a notable magic square (pictured
below) in 1514 which contained the year across the bottom.
HTML https://i.imgur.com/fe0i9Vp.gif
(3) In 1693 all 880 normal magic squares with N=4 were published
in Des quarrez ou tables magiques
HTML https://www.worldcat.org/title/des-quarrez-sic-ou-tables-magiques/oclc/490441998<br
/>by Bernard Frenicle de Bessy.
(4) In 1769 Benjamin Franklin describes his own magic square
with many interesting symmetries.
Research
Prajapati, Ramashankar & JAIN, JAYESH. (2017). A STUDY ON MAGIC
SQUARES.
HTML https://www.researchgate.net/publication/315457341_A_STUDY_ON_MAGIC_SQUARES
My Magic Squares
(1) This is my 2019 magic square with N=5, in the style of
Albrecht Durer.
HTML https://imgur.com/tEEL2ga.gif
#Post#: 4--------------------------------------------------
Re: Magic Polygons
DIR By: Dragon Hellfire
Date: March 10, 2019, 10:22 pm
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All N=3 Normal Magic Squares
HTML https://i.imgur.com/GzW6elK.gif
Rotate by 90, 180, or 270 degrees to obtain four solutions.
Each of these solutions may have their columns/rows that do not
contain 1 (or 9) permuted to obtain another solution.
4x2=8 total solutions
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