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- NATION, Page 37American NotesMATHEMATICSAs American as Apple Pi
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- Pi, as every schoolchild used to know, is the ratio of the
- circumference of a circle to its diameter. But in the
- electronic age, the ancient Babylonian constant -- or rather the
- accurate calculation of its value -- has become a symbol of
- computational prowess. In the 1950s the U.S. led the way,
- churning out estimates of pi accurate to thousands and tens of
- thousands of decimal places. Then the French took the lead. With
- the emergence of Japan's supercomputer industry in the 1980s,
- pi has become an almost exclusive province of the Japanese. The
- last world record, 201 million digits, was set on a Japanese
- supercomputer in 1988.
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- Now 3.14159 . . . is once again as American as apple pie.
- Or nearly so. Using U.S.-made supercomputers, two Columbia
- University mathematicians have established a new record: 480
- million digits, a number that, if printed out linearly, would
- extend 600 miles. The feat was accomplished by David and Gregory
- Chudnovsky, Soviet emigre brothers who took jingoistic pride in
- beating the Japanese. "They may have faster supercomputers,"
- says David Chudnovsky, "but they don't have our Yankee
- know-how."
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