High Quality Content by WIKIPEDIA articles! Jon Hal Folkman (December 8, 1938 – January 23, 1969) was an American mathematician, a student of John Milnor, and a researcher at the RAND Corporation. Jon Folkman contributed important theorems in many areas of combinatorics. In geometric combinatorics, Folkman is known for his pioneering and posthumously-published studies of oriented matroids; in particular, the Folkman–Lawrence representation theorem is "one of the cornerstones of the theory of oriented matroids". In graph theory, he was the first to study semi-symmetric graphs, and he discovered the semi-symmetric graph with the fewest possible vertices, now known as the Folkman graph. In the late 1960s, Folkman suffered from brain cancer; while hospitalized, Folkman was visited repeatedly by Ronald Graham and Paul Erdos. After his brain surgery, Folkman was despairing that he had lost his mathematical skills. As soon as Folkman received Graham and Erdos at the hospital, Erdos challenged Folkman with mathematical problems, helping to rebuild his confidence.

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