English

THE SUDOKUS OF THE EIGHTEENTH CENTURY

Leonhard Euler (1707 - 1783) one of the great mathematicians of history, studied these squares where the symbols cannot be repeated neither in rows nor in columns. They are the Latin squares (since as symbols it used Latin letters).

It also incorporated a new series of symbols, Greek letters, which could not be repeated even by columns. These new squares were called Greco-Latin squares.

Euler built Greco-Latin 4x4 and 5x5 squares. The 6x6 square he raises in this text as the problem of placing 36 officers of 6 different ranks and 6 different regiments in a square without either ranks or columns in either row or repeated regimes, he considered impossible to build even though he could not prove it.

WOULD YOU TRY TO DO IT?

The color box made with cross stitch is a 10x10 Greco-Latin square.

Try to build a 4x4 Greco-Latin square with the 16 cards or the 16 little soldiers.