Author(s): Hoffman, Paul AN: 7536269
Section: POP 10 SCI 
MANJUL BHARGAVA 

 
 
Contents
PRINCETON WUNDERKIND BANGS THE DRUM FOR THE BEAUTY OF NUMBER THEORY. 

5 MATHEMATICS PRINCETON UNIVERSITY 

PRINCETON WUNDERKIND BANGS THE DRUM FOR THE BEAUTY OF NUMBER THEORY. 

Manjul Bhargava is sitting on the floor of his sparse apartment in front of his tabla, a pair of small Indian drums. "They really need to be tuned," he says self-consciously. But then his tapping fingers glide over the drums, and a rhythmic, bell-like sound fills the room. "Music is about mathematical relationships," he says, "and my music teacher told me that I should be able to master the tabla because I am a mathematician. But if I were thinking now about the mathematics, you wouldn't like what you're hearing. I need to play intuitively." At Princeton, where he is a visiting research scholar with a joint appointment at the elite Institute for Advanced Study, Bhargava's specialty is number theory, a branch of pure mathematics. Practitioners in this abstract realm don't look for real-world applications, though sometimes those arise later. The cryptographic techniques the U.S. government uses to encode sensitive information, for example, depend on number theory.

Only 28, Bhargava has already impressed many leaders in his field. His Ph.D. advisor, Andrew Wiles (known for solving the centuries-old puzzle known as Fermat's Last Theorem), says Bhargava's thesis was one of the strongest he's seen in 20 years. "We are watching him very closely. He is going to be a superstar," says Peter Sarnak, a Princeton colleague. "He's amazingly mature mathematically. He is changing the subject in a fundamental way." For his Ph.D., which he earned last year, Bhargava extended some work of the legendary 19th-century German mathematician Carl Friedrich Gauss, work that forms the basis of modern algebraic number theory.

As with the tabla, so with numbers: Bhargava does math "intuitively," attacking problems from unexpected quarters when he finds he's making no headway with a straightforward approach: "Often I don't think about a particular problem at all, but just think, and the problem being solved emerges later." A recent accomplishment was an elegant proof of a far-reaching theorem. In 1770, Joseph-Louis Lagrange, perhaps the greatest mathematician of the 18th century, showed that every positive integer can be expressed as the sum of four squares. (Take the integer 10: l0 = 12 + 12 + 22 + 22. Or 30: It's equal to 12 + 22 + 32 + 42.) In 1916, self-taught Indian prodigy Aiyangar Srinivasa Ramanujan discovered 54 other such integer-generating formulas, called "quadratic forms." In 1993, William Schneeberger and John Conway at Princeton proved that if a quadratic form could generate the first 15 integers, it could generate all positive integers. They called this the Fifteen Theorem, but its proof was so intricate they never published it. Bhargava found a proof that was not only simpler but that also expanded the result so that it applied to the generation of any specific set of integers--such as all the odd numbers. Sounds complicated, but "mathematics," Bhargava says, "is about beauty"--about revealing hidden connections between numbers, shapes, and other mathematical objects. His preferred place to contemplate that beauty is in the woods near the Institute pond, where giants like Albert Einstein and John Nash also went to think. There, beneath the forest canopy, he builds on the work of his mathematical forebears.

PHOTO (COLOR): MANJUL BHARGAVA

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By Paul Hoffman


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Source: Popular Science, Nov2002, Vol. 261 Issue 5, p94, 2p
Item: 7536269
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