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A Magic Square of order n is an arrangement of the numbers from 1 to n^2 (n-squared) in an n by n matrix. The sum of any row, any column, or any main diagonal must be the same. The smallest non-trivial case is of order 3. The same idea can be extended to other shapes such as stars, cubes, circles, and so on. These are called Magic objects.
条目 (20+)
Archimedes And The Computation Of Pi
http://www.math.utah.edu/~alfeld/Archimedes/Archimedes.html
Did You Ever Wonder Why the Digits of Pi Look Random?
https://www2.lbl.gov/wonder/bailey.html
Freely Available Software for the Solution of Linear Algebra Problems
http://www.netlib.org/utk/people/JackDongarra/la-sw.html