MATHEMATICS

Selasa, 19 April 2011

Magic squares of type 5-by-5

Still in 're-discovery mode' generating magic squares has become trivial, although the computational resources increase fast depending on the size of the square.
$$\left(
\begin{array}{ccccc}
14 & 32 & 6 & 8 & 22 \\
14 & 7 & 30 & 17 & 14 \\
0 & 26 & 24 & 22 & 10 \\
44 & 9 & 16 & 7 & 6 \\
10 & 8 & 6 & 28 & 30
\end{array}
\right)$$
$$\left(
\begin{array}{ccccc}
4 & 22 & 6 & 28 & 42 \\
4 & 37 & 30 & 17 & 14 \\
20 & 26 & 24 & 22 & 10 \\
64 & 9 & 16 & 7 & 6 \\
10 & 8 & 26 & 28 & 30
\end{array}
\right)$$
$$\left(
\begin{array}{ccccc}
4 & 6 & 22 & 26 & 64 \\
6 & 55 & 30 & 17 & 14 \\
16 & 34 & 24 & 42 & 6 \\
86 & 7 & 16 & 7 & 6 \\
10 & 20 & 30 & 30 & 32
\end{array}
\right)$$

About definitions.

Magic square
A magic square is a square matrix with elements in $\mathbf{Z}$ such that the totals of rows, columns and both diagonals are equal.
Normal magic square
A normal magic square is a magic square with elements $1,2, \cdots, n^2$ where $n$ is the size of the matrix.
Latin square
A latin square is a $n$ by $n$ square matrix containing $n$ times the first $n$ elements of the alphabet such that each row and each column contains each letter only once. (i.e. Cayley Table)

Further developments

Clearly, normal magic squares are the most desirable objects in the realm of matrices. I am making detailed notes about this work in the ( still? ) unpublished personal mathematics wiki I am setting up.

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