EBSCOhost
| Author(s): |
Hoffman, Paul |
| AN: |
7536269 |
Section: POP
10 SCI
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5 MATHEMATICS PRINCETON UNIVERSITY
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
~~~~~~~~
By Paul Hoffman
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Source: Popular
Science, Nov2002, Vol. 261 Issue 5, p94, 2p
Item: 7536269 |
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