{ magic squares debunking the magic radu sorici the university of texas at dallas
TRANSCRIPT
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Magic Squares
Debunking the Magic
Radu Sorici
The University of Texas at Dallas
Random Magic Square
• No practical use yet great influence upon people
• No practical use yet great influence upon people
• In Mathematics we study the nature of numbers and magic squares are a perfect example to show their natural symmetry
History is Very Important1. There is evidence to date magic squares as early as the 6th century due to Chinese
mathematicians
History is Very Important1. There is evidence to date magic squares as early as the 6th century due to Chinese
mathematicians2. It was later discovered by the Arabs in the 7th century
History is Very Important1. There is evidence to date magic squares as early as the 6th century due to Chinese
mathematicians2. It was later discovered by the Arabs in the 7th century3. The “Lo Shu” square is the first recorded magic square
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History is Very Important1. There is evidence to date magic squares as early as the 6th century due to Chinese
mathematicians2. It was later discovered by the Arabs in the 7th century3. The “Lo Shu” square is the first recorded magic square
4. The sum in each row, column, diagonal is 15 which is the number of days in each of the 24 cycles of the Chinese solar year
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History is Very Important1. There is evidence to date magic squares as early as the 6th century due to Chinese
mathematicians2. It was later discovered by the Arabs in the 7th century3. The “Lo Shu” square is the first recorded magic square
4. The sum in each row, column, diagonal is 15 which is the number of days in each of the 24 cycles of the Chinese solar year
5. Magic squares have cultural aspects to them as well, for example they were worn as talismans by people in Egypt and India. It went as far as being attributed mythical properties. (Thank you Wikipedia for great information)
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So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square• A normal magic square is a magic square containing the numbers
1 through
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square• A normal magic square is a magic square containing the numbers
1 through • Normal magic squares exist for all except for
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square• A normal magic square is a magic square containing the numbers
1 through • Normal magic squares exist for all except for • For we simply get the trivial square containing 1
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square• A normal magic square is a magic square containing the numbers
1 through • Normal magic squares exist for all except for • For we simply get the trivial square containing 1• For we would have the following square
Which would imply that
But then this is not a normal magic square.
So what exactly is a Magic Square?• A magic square is an x table containing integers such that the
numbers in each row, column, or diagonal sums to the same number
• The order of a magic square is the size of the square• The above definition is rather broad and we usually will be using
what is called a normal magic square• A normal magic square is a magic square containing the numbers
1 through • Normal magic squares exist for all except for • For we simply get the trivial square containing 1• For we would have the following square
Which would imply that
But then this is not a normal magic square.• For we will prove that a normal magic square exists
Before we Start1. The sum of numbers in each row, column, and diagonal is called the
magic constant and is equal to
Before we Start1. The sum of numbers in each row, column, and diagonal is called the
magic constant and is equal to
This is true because the sum of all the numbers in the magic square is equal to
and because there are rows we can divide by to obtain the above result
Before we Start1. The sum of numbers in each row, column, and diagonal is called the
magic constant and is equal to
This is true because the sum of all the numbers in the magic square is equal to
and because there are rows we can divide by to obtain the above result2. For ,… the magic constants are
Before we Start1. The sum of numbers in each row, column, and diagonal is called the
magic constant and is equal to
This is true because the sum of all the numbers in the magic square is equal to
and because there are rows we can divide by to obtain the above result2. For ,… the magic constants are 3. For odd the middle number is equal to
Types of Magic Squares• Singly even - • Doubly even - • Odd - • Antimagic - the rows, columns, diagonals are consecutive integers
(mostly open problems)• Bimagic - if the numbers are squared we still have a magic square• Word - a set of words having the same number of letters; when the
words are written in a square grid horizontally, the same set of words can be read vertically
• Cube - the equivalent of a two dimensional magic square but in three dimensions
• Panmagic - the broken diagonals also add up to the magic constant• Trimagic - if the numbers are either squares or cubed we still end up
with a magic square• Prime - all the numbers are prime• Product - the product instead of the sum is the same across all rows,
columns, diagonals• And many more
Construction MethodsOdd orders (De la Loubère)
Construction MethodsOdd orders (De la Loubère)
Construction MethodsOdd orders
Construction MethodsDoubly Even• 1st step is to write the numbers in consecutive order from the top left to the bottom
right and delete all the numbers that are not on the diagonals• 2nd step is to start writing the numbers the numbers that are not on the diagonals in
consecutive order starting from the bottom right to the top left in the available spots. For example for
Construction MethodsDoubly Even• 1st step is to write the numbers in consecutive order from the top left to the bottom
right and delete all the numbers that are not on the diagonals• 2nd step is to start writing the numbers the numbers that are not on the diagonals in
consecutive order starting from the bottom right to the top left in the available spots. For example for
Construction MethodsSingly Even• The Ralph Strachey Method
Construction MethodsSingly Even• The Ralph Strachey Method for orders of the form • 1st Step – Divide the square into four smaller subsquares ABCD
A C
D B
Construction MethodsSingly Even• The Ralph Strachey Method• 2nd Step – Exchange the leftmost columns in subsquare A with the corresponding
columns of subsquare D and exchange the rightmost columns in subsquare C with the corresponding columns of subsquare B
Construction MethodsSingly Even• The Ralph Strachey Method• 3rd Step - Exchange the middle cell of the leftmost column of subsquare A with the
corresponding cell of subsquare D. Exchange the central cell in subsquare A with the corresponding cell of subsquare D
What Now?
Panmagic Square• A panmagic(also called diabolical) square is a magic square with the additional property
that the broken diagonals also add up to the magic constant.
Panmagic Square• A panmagic(also called diabolical) square is a magic square with the additional property
that the broken diagonals also add up to the magic constant.• The smallest non-trivial panmagic squares are squares such as
Panmagic Square• A panmagic(also called diabolical) square is a magic square with the additional property
that the broken diagonals also add up to the magic constant.• The smallest non-trivial panmagic squares are squares such as
• Any 2 by 2 square including the ones warping around edges, the corners of 3 by 3 squares, displacement by a (2,2) vector, all add up to the magic constant!!!
Panmagic Square• A panmagic(also called diabolical) square is a magic square with the additional property
that the broken diagonals also add up to the magic constant.• The smallest non-trivial panmagic squares are squares such as
• Any 2 by 2 square including the ones warping around edges, the corners of 3 by 3 squares, displacement by a (2,2) vector, all add up to the magic constant!!!
• The above three panmagic squares are the only 3 that exist for the numbers 1 through 16.
Panmagic Square Continued• 5 by 5 panmagic squares introduces even more magic
Panmagic Square Continued• 5 by 5 panmagic squares introduces even more magic – quincunx
17+25+13+1+9=6521+7+13+19+5=654+10+13+16+22=6520+2+13+24+6=65
Magic Cube• A magic cube is a magic square but in 3-D. All of the properties are translated to 3-D.
Magic Cube• A magic cube is a magic square but in 3-D. All of the properties are translated to 3-D.• The magic constant is . Why?
Magic Cube• A magic cube is a magic square but in 3-D. All of the properties are translated to 3-D.• The magic constant is . Why?• Because there are rows and the total sum is .
Magic Cube• A magic cube is a magic square but in 3-D. All of the properties are translated to 3-D.• The magic constant is . Why?• Because there are rows and the total sum is .
Bimagic Square• A Bimagic Square is a magic square that is also a magic square if all of its numbers are
squared
Bimagic Square• A Bimagic Square is a magic square that is also a magic square if all of its numbers are
squared• The first known bimagic square is of order 8
Bimagic Square• A Bimagic Square is a magic square that is also a magic square if all of its numbers are
squared• The first known bimagic square is of order 8• It has been shown that all 3 by 3 bimagic squares are trivial
Bimagic Square• A Bimagic Square is a magic square that is also a magic square if all of its numbers are
squared• The first known bimagic square is of order 8• It has been shown that all 3 by 3 bimagic squares are trivial
• Proof: Consider the following magic square and note that because
. In addition, by the same reasoning we have that Thus
Hence In the same way we get that all other numbers are equal as well.
Multiplication Magic Square• A square which is magic under multiplication is called a multiplication magic square. The
magic constants increase very fast with the order of the square.
Multiplication Magic Square• A square which is magic under multiplication is called a multiplication magic square. The
magic constants increase very fast with the order of the square.• For orders 3 and 4 the following are the smallest multiplication magic squares
Word Square• A set of words having the same number of letters; when the words are
written in a square grid horizontally, the same set of words can be read vertically
Word Square• A set of words having the same number of letters; when the words are
written in a square grid horizontally, the same set of words can be read vertically
• Because we speak English we are naturally interested in the ones made of English words
Word Square• A set of words having the same number of letters; when the words are written in a square
grid horizontally, the same set of words can be read vertically • Because we speak English we are naturally interested in the ones made of English words• There are word squares of order 3 through 9 (cases 3, 4, 9 are displayed below)
B I T C A R D A C H A L A S I AI C E A R E A C R E N I D E N ST E N R E A R H E X A N D R I C
D A R T A N A B O L I T E L I N O L E N I N A D D L E H E A D S E R I N E T T E I N I T I A T O R A S C E N D E R S
The hunt for a word square of order 10 is still going and apparently it has been called the holy grail of logology.
Fibonacci Magic Square• The presentation would not be complete with a reference to the Fibonacci numbers
Fibonacci Magic Square• The presentation would not be complete with a reference to the Fibonacci numbers• Start with the basic 3 by 3 magic square
Fibonacci Magic Square• The presentation would not be complete with a reference to the Fibonacci numbers• Start with the basic 3 by 3 magic square
• Replace each number with its corresponding Fibonacci number
Fibonacci Magic Square• The presentation would not be complete with a reference to the Fibonacci numbers• Start with the basic 3 by 3 magic square
• Replace each number with its corresponding Fibonacci number
• Even though this is not a magic square it so happens that the sum of the products of the three rows is equal to the sum of the products of the three columns.
Random Magic Square
Final WordsMasonic Cipher
Final WordsMasonic Cipher
Durer Magic Square
Final WordsThe message is
Final WordsThe message is
I Love Mathematics