- Latin Squares. – Sudoku puzzles are an example of what the famous mathematician Leonhard Euler (Swiss mathematician and physicist; 1707 – 1783) called Latin Squares : these are square tables filled with digits, letters, or symbols so that each of the entries occurs only once in each row or column. (Notice that Sudoku puzzles have the added requirement that each of the little 3 × 3 contain the digits 1–9 only once.)

Figure 3 shows a beautiful example of a Latin Square which does not use digits or letters: in this stained glass window, each of the seven colors occurs only once in each row and in each column.

Displaying a Latin square, this stained glass window honors Ronald

Fisher, whose ”Design of Experiments” discussed Latin squares. Fisher’s student, A. W. F. Edwards, designed this window for Caius College, Cambridge.

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