What is magic square?

1.
The rules in magic square are all the numbers in the rows, columns and diagonals should added up to be equal.

圖片參考：http://upload.wikimedia.org/wikipedia/commons/thumb/e/e4/Magicsquareexample.svg/180px-Magicsquareexample.svg.png

2.
The one who invented Magic Square is called Leri , a mathematician in France , in 1901.

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http://en.wikipedia.org/wiki/Magic_square