### David E. Zitarelli

The general topology of a connected topological space appeared early in the twentieth century in the work of American mathematicians in and associated with the University of Chicago. The author tells the history of these workers, of their work, and of its transmittal through the meetings and journals of the AMS.

(pp. 450)

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### J. F. Crook

Sudoku puzzles can be regarded as three by three arrays of boxes each consisting of a three by three array of cells. Cells are to be filled by the integers one to nine, with no repititions in each row, column, and box. Some cells are already filled, and the solver is to fill in the rest. Solving by computer search is straightforward; the popularity of the puzzle comes from the thinking involved in hand solution. The author presents an algorithm for the latter.

(pp. 460)

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