Euler Sudoku
The symbols e, π, i, 0, 1, f, Σ, φ, and γ must each appear exactly once in each row, column, and 3x3 block.
Appeared in the MAA MD/DC/VA Newsletter, for the Maryland/DC/Virginia section of the Mathematical Association of America, October 2007, in celebration of the 300th anniversary of Euler's birth. Each of the symbols in the puzzle is associated with the great mathematician Leonhard Euler; for example, four of the symbols come from Euler's identity eiπ + 1 = 0.
