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    Education Supplementby Dennis LimSatisfying a Zeta JonesBrainiacs Around the World Apply Themselves to the Mathematical Challenge That

    Dared Not Speak Its NameUntil Now!April 16 - 22, 2003

    (illustration: Patrick Arrasmith)

    nA Beautiful Mind, the first publicmanifestation of John Nash'sworsening mental state occursduring a lectureRussell Crowe'smathematician trails offmidsentence, hallucinates demonsfiling into the hall, and before anuncomprehending audience,stumbles from the podium.Trumped-up movie moment? If

    anything, Ron Howard's biopicunderplays the significance of thatepisode, perhaps apparent to viewerswho picked up on Nash's fragmentedstream of consciousness ("the zerosof the Riemann zeta function") ordeciphered the chalk squigglesbehind him (an equation linking an

    infinite sum to an infinite product; the letters "P.N.T.," denoting the Prime NumberTheorem). Sylvia Nasar's Nash bio fills in the details: It was the winter of 1959, andan expectant crowd had gathered at Columbia University assuming that Nash wasabout to deliver a proof to a mathematical mysteryabsolutely central to numbertheory and exactly a century old by thenknown as the Riemann Hypothesis.

    It remains unconquered to this day. Nash's crash-and-burn was more dramatic thanmostdistracted and mumbling, he incoherently linked the hypothesis to arcanecosmology. But he is just one in a long line of formidable thinkers to haveunsuccessfully tackled this conjecture, formulated by Bernhard Riemann in 1859 in abrief paper titled "On the Number of Prime Numbers Less Than a Given Quantity."In 1900, mathematician David Hilbert, addressing a conference in Paris, outlinedwhat he judged the greatest unsolved problems in mathematics. Of the so-calledHilbert Problems (discounting the handful later deemed too vague for decisivesolutions), the only one still standing at the start of the 21st century is the RiemannHypothesis. In 2000, the Clay Mathematics Institute in Cambridge, Massachusetts,threw down the gauntlet again, announcing seven Millennium Problemsamongthem the R.H.each one with a million-dollar prize attached.

    Math conundrums have been known to languish unsolved for a seeming eternity.Long considered the holy grail, Fermat's Last Theorem (another Hilbert Problem)had stumped all comers for some 350 years before Andrew Wiles finally cracked itin 1994. There has been a flurry of RH research activity recently, spurred more byWiles's triumph than the cash prize (mathematicians agree that immortal glory awaitsthe person who provesor refutesthe hypothesis). "People would never publiclyacknowledge that they were working on the Riemann Hypothesis," says DorianGoldfeld, a professor of mathematics at Columbia. "Now everyone's coming out ofthe closet." Brian Conrey, director of the American Institute of Mathematics in PaloAlto, California, writes in the March issue ofNotices, the journal of the AmericanMathematical Society, "Now is arguably the most exciting time in its history to beworking on R.H."

    This month sees the publication of no fewer than three popular-math books focusingon primes and the hypothesis: Marcus du Sautoy's The Music of the Primes(HarperCollins), Karl Sabbagh's The Riemann Hypothesis (Farrar, Straus andGiroux), and John Derbyshire's Prime Obsession (Joseph Henry Press). WhileWiles's proof made the front page of the Times, inspiring a bestseller (Simon Singh'sFermat's Enigma) and even an Off-Broadway musical (Fermat's Last

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    The Village Voice: Education: Education Supplement: Satisfying a Zeta Jones by Dennis Lim

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    Tangosample lyric: "Your proof contains a big fat hole"), it's questionable if theRiemann Hypothesis has similar crossover potential, not least because it still lacks ahappy ending. At first glance, Fermat's is straightforward enough to seducemathophobes; it simply states that there are no whole-number solutions of the

    equationxn+yn =zn for n > 2. (The form will be familiar to anyone with even thefaintest recollection of the Pythagorean Theorem.) By comparison, even aperfunctory definition of the Riemann Hypothesis necessarily entails an infinite

    series called the zeta function (1 + 1/2s + 1/3s + 1/4s + . . . ), which, for certain valuesofs, has a finite answer, and the daunting abstraction of complex numbers, whichconsist of real and imaginary parts.

    From a mathematical standpoint, though, a Riemann proof would be more significantthan the Fermat solution. It would shed light on the most basic objects inmathematics: prime numbers. A prime is a number perfectly divisible only by itselfand the number 1; while every other number can be expressed as the product of atleast two primes, the primes themselves are irreducible (11, 89, and 6,971, forinstance, are prime; 15, which can be written as 3 x 5, is not). Pick your sciencemetaphor: The primes are the atoms, the periodic elements, the genetic code ofmathematics, and it frustrates mathematicians to no end that something sofundamental should remain so intractably mysterious. Primes seem to be randomlystrewn amid the positive integers. Since their sequence conforms to no discernibleformula, it's impossible to tell when the next prime will pop up.

    Despite their chaotic behavior, as du Sautoy writes, the primes have a "timeless,universal character. Prime numbers would be there whether we had evolvedsufficiently to identify them." In Carl Sagan's novel Contact(1985), scientists realizethat the messages being transmitted from Vega are prime-number pulsesand thussigns of intelligent life. In discussing the primes, mathematicians often use thevocabulary of first love. "They're objects of great beauty, no question," says AIM'sConrey, explaining how as a teenager he fell for the Twin Prime Conjecture, whichstates that there are an infinite number of pairs of primes separated by 2, like 3 and 5,17 and 19 (it's still unproved).

    For a vivid picture of prime fetishism, check out Chris Caldwell's encyclopedic andsurprisingly addictive Prime Pages (www.utm.edu/research/primes). Among the

    contents: a list of the largest known primes (updated weekly), a primality test for

    numbers smaller than 253 - 1, and abundant prime trivia ("17 was the original title ofthe Beatles song 'I Saw Her Standing There' "). Over at the Aesthetics of the PrimeSequence (2357.a-tu.net), a counter reels off primes as you listen to spooky

    minimalist compositions derived by feeding prime numbers into an algorithm, ortake a prime intuition test (a crude de facto autism test, perhapsOliver Sacks oncerecounted the bizarre case of autistic twin brothers whose private language consistedof exchanging primes of up to 20 digits).

    Prime number theory dates to 350 B.C., when Euclid proved that there are an infinitenumber of primes. But it was Karl Friedrich Gauss, a future teacher of Riemann's,who in the late 18th century laid the groundwork for the latter's breakthrough. At 14,Gauss observed that while individual primes are randomly dispersed, there is anoverall pattern to their density: Not only do they thin out the higher you count, the

    proportion of primes seems to follow a logarithmic function. (For Gauss, accordingto Sabbagh's book, counting primes was a pastimeit's said that by the time he died,he'd gotten to 3 million.) His conjecture, that the number of primes less than anygiven number n is approximately n/log n (proved more than a century later in 1896),is called the Prime Number Theorem.

    Gauss's formulation provided only an estimate. Riemann, using the zeta function,derived an exact formula for the number of primes smaller than any given number.The Swiss mathematician Leonhard Euler had discovered that the zeta function,which we defined above as an infinite sum involving all the natural numbers (1, 2, 3,. . . ), could also be expressed as an infiniteproductinvolving just theprimenumbers. This was, as du Sautoy writes, "the first sign that the zeta function mightreveal unexpected links between seemingly disparate parts of the mathematicalcanon." Riemann's insight was to plug complex numbers into the zetafunctioncomplex numbers have real and imaginary parts, the latter being numbersthat can be expressed in terms ofi, where i is the square root of -1.

    These suspicious-sounding numbers may seem like a flight of mathematicalfancythey were first "imagined" in the 16th century and found to have enormouscomputational significance, but even mathematicians needed a few hundred years to

    The Village Voice: Education: Education Supplement: Satisfying a Zeta Jones by Dennis Lim

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    wrap their heads around the concept, just as it took the ancient Greeks a while to getused to the initially horrifying idea of fractions. (Barry Mazur's recentImaginingNumbers offers an eccentric road map through this abstract terrain.)

    Riemann relocated the enigma of prime distribution to the complex plane (a 2-Dplane with the x-axis real and the y-axis imaginary). This magical shift, which duSautoy likens to a beyond-the-looking-glass maneuver, revealed an astonishingregularity. The complex numbers for which the zeta function equals zero are calledthe Riemann zeros; the frequency of the Riemann zeros mirrors the frequency of theprimes. Riemann's famous hypothesis, which he declared sehr wahrscheinlich ("veryprobable"), was that, mapped on the complex plane, these solutions fall on a straight

    lineto be exact, the vertical line that runs through the point 1/2 on the real axis.

    Convoluted as it sounds, this gloss on the problem grossly simplifies the headymathematics at its core. All three new books are careful not to outpace the generalreader. Du Sautoy, a professor at Oxford, provides a panoramic history ofprime-number crunching, rich with anecdote and unfailingly patient with themathematical fine points. Sabbagh, a documentary producer, uses the R.H. to tunnelinto the mathematical mind, folding in copious interviews with number theorists. Hisapproach to the math is at once reassuring and deflationary. Chapter 16 opens: "Afterfifteen chapters of a book on the Riemann Hypothesis, I have to break some badnews to you. You know almost nothing about the Riemann Hypothesis comparedwith what there is to know." Derbyshire, aNational Review columnist, has writtenthe most mathematically detailed of the trio. Those looking for a quick, lucid R.H.

    initiation should consult Keith Devlin's evocative chapter in The MillenniumProblems (Basic Books, 2002), which also takes on the other six Clay puzzles.

    Like many other conjectures, the Riemann Hypothesis could conceivably bedisproved by brute tenacityrepeatedly testing it until a counterexample is found.Indeed, the R.H. has been checkedand holds truefor the first 100 billionRiemann zeros. At the AT&T Labs in Princeton, supercomputers keep cranking outzeros, an alarm ready to go off if and when the first zero strays from the so-calledcritical line.

    You'd think this would count as overwhelming evidence in favor of the hypothesis,but mathematics is a science of absolutes, insisting on the concreteness of universaltruth as if to compensate for some of its more vaporous abstractions. Du Sautoy saysin an e-mail interview, "For the other sciences, evidence in the lab is everything. In

    the mathematician's lab, such evidence can be completely misleading." In otherwords, extrapolation is a fool's game when you're dealing with infinity. "The primesare a malicious bunch of numbers," du Sautoy continues. "They're the masters ofdisguise. People have made conjectures about primes supported by billions of piecesof computer evidence, but theoretical analysis has later revealed the evidence to be acharade."

    There is the notorious failure of Merten's Conjecture, proved false in 1983 afterbeing verified for the first 10 billion cases. Columbia's Goldfeld points to theearly-20th-century insights into Gauss's P.N.T. estimate, which was long assumed tobe an overestimate. The English mathematician J.E. Littlewood proved in 1914 thatat some point Gauss's formula becomes an underestimate. Two decades later StanleySkewes proved that this happens before

    Ten to the 10th power, to the 10th power, to the 34th powera strong contender forthe most meaningless result in mathematics, since Skewes's number, as it would becalled, is so preposterously huge as to be beyond human comprehension (there arefewer atoms in the universe, Goldfeld points out). This "upper bound" has since been

    reduced to 10371, but the moral is that the AT&T computers could go on firingforever, and the eternal absence of any delinquent zeros would not in itself make fora proof.

    Most obviously, a proof of the R.H. would have a domino effect on numeroussubsequent theorems that begin by assuming its truth. (The turmoil that a falseverdict would wreak on their field is something mathematicians prefer not to thinkabout.) But a proof will mean more than simple verification. "It's not just aboutknowing, yeah, the R.H. is true," explains Conrey. "If that was all, we might as well

    assume it right now and go about our business, because it probably is true." The hopeis that something fundamental will be uncovered, since, as Conrey says, "theRiemann zeta function represents a connection between addition and multiplicationthat we don't yet understand." A proof could be the first step toward a grand unifiedfield theory. "The history of mathematics can be seen as the evolution of a languageto articulate structure and patterns," du Sautoy says. "Many feel that we still haven't

    The Village Voice: Education: Education Supplement: Satisfying a Zeta Jones by Dennis Lim

    http://www.villagevoice.com/issues/0316/edlim.php (3 de 5) [24/11/2003 16:37:03]

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    developed the right language to articulate why the Riemann Hypothesis is true." AsGoldfeld puts it, "With a problem that old, solving it usually means having to inventa whole new type of mathematics. You're not going to do it with a little hat trick."

    Parallel mysteries are being toppled all the time. In the most important recentbreakthrough, Indian computer scientist Manindra Agrawal and two of his studentsstunned mathematicians last August when they unveiled a relatively straightforwardalgorithm that would test if any given number is prime. Just two weeks ago, AIMannounced a major number theory development by Dan Goldston and CemYildiriman approach toward "small gaps between consecutive primes" that could

    help prove Conrey's beloved Twin Prime Conjecture.

    In real-world terms, an R.H. proof would likely have massive implications forcryptography. The security of Internet transactions relies on the virtual impossibilityof factoring extremely large numbers; a public-key encryption system deploys twolarge primes (kept secret, used for decryption) and their product (public knowledge,used for encryption). Agrawal's primality test sent a wave of anxiety rippling throughthe world of cryptography, suggesting that a discovery in the related area of factoringcould be imminent. Du Sautoy compares the elusive factoring algorithm to aspectrometer, which breaks down molecules into their composite atoms. "Since theRiemann Hypothesis holds the prospect of revealing the secret harmony underlyingthe primes," he adds, "its proof might provide insight into how to build aprime-number spectrometer. The Riemann Hypothesis could bring e-business

    crashing to the ground."Some believe a proof could have literally cosmic significance. The chance meetingbetween mathematician Hugh Montgomery and physicist Freeman Dyson, overafternoon tea at Princeton in 1972, is a key moment in Riemannic lore. Dysonnoticed that Montgomery's formula for the spacings between Riemann zeroscorresponded to a formula for the spacings between energy levels for a chaoticsystem. Could quantum physics and number theory somehow be linked? (MaybeNash's lecture on space-time singularities wasn't so far off.) In the '90s, Frenchmathematician Alain Connes attempted to bridge the two fields by enlisting a newtype of geometry involving infinite-dimensional spaces, though the extremeobscurity of his approach can be judged by just how many in the math communityfell prey to the April Fool's e-mail that circulated in 1997 claiming that a youngphysicist, after attending a Connes lecture, had quickly dashed off a proof based on,among other things, "anyons and morons with opposite spins."

    AIM, co-founded by Silicon Valley mogul John Fry as a nonprofit organization forcollaborative mathematics, leads the way in Riemann research. Even though Wilesfamously worked on Fermat's in isolation (and the cash prize is surely an incentive tohole up by yourself), Conrey says the response to the institute's R.H. symposia hasbeen enthusiastic: "We've sped things up a bit. There are a lot more people thinkingabout it now."

    After 140-plus years, is a solution in sight? Is it even possible to tell? Goldfeldexpresses cautious optimism: "I think it'll be cracked in 10 to 20 years." But, he adds,"most of the approaches to the Riemann Hypothesis do seem too close to theproblem. What we need is someone who'll connect it with something really

    different." Conrey says he's most encouraged by the work of Rutgers professorHenryk Iwaniec in the area of Mbius functions. It's worth noting that according toKurt Gdel's Undecidability Theorem (an elaboration of the liar's paradox), somestatements are true but can never be proved. (Indeed, one of the Hilbert problemswas proved to be unprovable.) Riemann never claimed his conjecture was provable,unlike Fermat, who left a taunting note in the margin, saying he'd run out of spacefor his "truly marvelous" proof. Still, there are hardly any mathematicians workingtoday who believe the Riemann Hypothesis to be false or unprovable, and for manyof them, keeping the faith is practically a religious imperative. "Aesthetics is the rootof most people's belief that the Riemann Hypothesis will turn out to be true," says duSautoy. "We're blessed with a subject where nature invariably chooses the mostbeautiful option."

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