Ancient Hindu Geometry: The Science of the Sulba by Bibhutibhushan Datta

By Bibhutibhushan Datta

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Rladachy. Ne\v York: Charles Scribner's Sons, 1966. Pages 231-241. Geonletry Recisited. H . S . 11. Coxeter. New York: Random House, 1967. Pages 89-93. Richard Bellman, Kenneth L. Cooke, and Jo A n n Lockett. New York: Academic Press, 1970. Chapter 3. Four Unusual Board Games DURINGthe 1960's there was a remarkable upsurge of interest in mathematical 1,oard garnes. Today more people than ever before are playing the traditional games such as chess and experimenting with the new games that keep turning up in the stores.

The first player wins by forcing his opponent to play in the upper right corner cell, where any mark will carry the path to the edge of the field. ) The game of Black is of special interest because soon after it was conceived a friend of Black's, Elwyn R. Berlekamp, hit on an elegant strategy that guarantees a win for one of the players. The strategy applies to rectangular fields of any size or shape. Since knowledge of the strategy destroys all interest in actual play, I urge you to play the game and see if you can match Berlekamp's brilliant insight before checking the answer section.

M. Oliver of the Hewlett-Packard Company in Palo Alto, California, "that the path appears as a 1 X 2 rectangle in all projections of the cube taken perpendicular to a face, as a rhombus in three of the isometric projections taken parallel to a diagonal of the cube, and as a regular hexagon in the fourth isometric view. " A similar cyclic path inside a tetrahedron was discovered by John H. Conway and later, independently, by Hayward in 1962. It is easy to reflect a tetrahedron three times [see Figure 271 and find a cyclic path that touches each side once.

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