JOST A MON

The idle ramblings of a Jack of some trades, Master of none

The second meeting

Venue – A Moscow Kitchen. October 2002.

Vladimir Voevodsky came to the interview not alone, announcing from the entrance that his prize should be shared with three people, of whom he couldn’t bring along the first and the third, but he had managed to snare the second.

VV: Let me introduce you: this is Yuri Shabat, Professor at the Moscow State University. If I make a mistake in something, he’ll correct me.

OO: And who is the first person?

VV: Well, actually even before him were the dinosaurs. When I was really little, I loved dinosaurs. And then books on chemistry began to fall into my hands; my mum brought them, she was a chemist. From theory I soon moved onto practice, and there were explosions in the bathroom, after which there were experiments with electricity, and then, going backwards, theoretical physics, which my father, a physicist, introduced me to. When I was seriously ill with pneumonia, my father’s friend Oleg Sheremetyev brought me a Rubik’s cube to distract me. There were no published solutions to the puzzle at the time, and I killed two days to crack it on my own. And then Oleg and I went on to solve more complicated mathematical puzzles. Oleg used to spend much time those days teaching mathematics to kids at the Pioneers Palace. He was the first to show me that mathematics could be interesting of itself, in a very pure sense.

OO: Volodya, you finished high school but you do not have a degree. Does that mean, by Russian standards, that you are under-educated?

VV: I was rusticated from Moscow University for academic failure. I was already interested in algebraic geometry, but attending classes seemed like such a waste of time. I took a break from academics, and began an apprenticeship at a vocational school where kids were being taught programming. One day, I found some scrap paper on a table with formulae scribbled over it – and immediately realised that there was someone around who thought just like me. I was overjoyed and went in search of the owner of that paper. And that’s how I found Yura Shabat. He didn’t deny it. “Yes,” he said, “These are my papers. So what?” Well, I said, I have also been thinking along those lines. It was very important to me that I had found him.

YS: Yes, and after that, we worked for a long time together.

OO: So what attracted you to algebraic geometry?

VV: Purely subjective factors, I have to say. At the time, algebraic geometry was being done by interesting people, such as Shafarevich.

OO: And how did the move to America come about?

VV: Even after returning to academics, I still wouldn’t attend classes. In 1989, then, obviously, everything collapsed, and such formalities as degrees seemed quite useless. After Yura Shabat, I began to work with Misha Kapranov, and we published several papers. Then he went off to graduate school in the States, talked about our work, and thanks to him, I became a graduate student at Harvard.

OO: Your relationship with America, it appears, was not entirely idyllic?

VV: To be honest, America impressed me at once. On the very first day I arrived at Harvard, I was handed keys to an apartment, to an office, and a cheque for a thousand dollars. And I was a mere graduate student! At the time, there were many Russian mathematicians on the faculty. Dmitri Kazhdan was Dean. I need to share my prize with him as well.  He and his colleagues supported me at a period when I could no longer live in Russia, and I was still new to America. I remember, during my first Christmas in Boston, I got drunk and wandered into a black ghetto. There I was robbed, beaten and hurled into the snow. This, of course, added to my discomfort; but I was deeply anguished, missing Moscow, and thinking how much I hated their Christmas. I wanted my New Year [My note: Russians celebrate New Year rather than Christmas], with a fir tree and my mum and presents. I went to Professor Joseph Bernstein, and said to him – I can’t stay here. He answered me in one sentence, “Well, if it’s so bad for you here, then go home.” I am eternally grateful to him for this. I went to Moscow for four months, and he covered up for me, saved my fellowship and stipend. Then I returned and lived for a few months in my office, writing up my dissertation quickly. When I went in the mornings to brush my teeth in my sweat-pants, students would be coming into the department and looking askance at me. But Dean Kazhdan gave me the possibility to complete my work in peace. So I got my doctorate, but without any college degree either from Russia or America.

OO: Was such an option open to you in Russia?

VV: Formally, it wasn’t prohibited, but it is clear that the entire procedure would have been much harder, and taken much longer. There have been earlier precedents, but in my opinion, perhaps more often in the pre-war days than today.

OO: Setting aside material comforts, what distinguishes a scientist’s life in Russia from that in America?

VV: Everything. It’s a different professional environment. In my own field, there are ten times as many people working in America. There is the corresponding level of competition. In Russia there is no direct relationship between a scientist’s academic success and financial situation. If a person is comes up with an extraordinary idea, then everybody says, ‘Praise God, we are happy,’ but his salary is not going to go up from tomorrow. In America, it is likely to increase; but if you prove something interesting with your colleagues, at once the question arises – who did what first? Because the prizes have to be divided. In Russia, when people think up the same idea simultaneously, it is rather nice. There’s a professional collegiality. But in the US, this would decrease the material consequences of a scientific achievement. Although I have to say that in mathematics this is not as strongly felt as in biology, chemistry or medicine.

OO: Besides science, you have always had a wide range of interests. You have travelled the world, kept up your interest in history, followed politics. You live in the US, your wife is Egyptian, and you have friends of various religious persuasions. You have, perhaps, a nuanced view of events in the world.

VV: Undoubtedly, I have a cosmopolitan regard of current events as I do constantly listen to views of people from different sides of the barricades. And it is not difficult for me to note that not all of them are true. No less, it is evident nuclear weapons that used to be so difficult to obtain, will become quite common. And I don’t see any reasons that can stop those people who want to use them. Clearly, nuclear war awaits us in the coming decades. On the other hand, in American scientific journals, such as Science, I regularly read that its consequences are not as scary as we might imagine.

OO: Well, thanks for the consoling thought… And what will happen to mathematics in these projections?

VV: Nothing good is going to happen to mathematics, even if there’s no nuclear war in the near future. Mathematics has developed over a long time with lots of intensive research. But today’s mathematics requires immensely larger resources: of people, time, and money. You understand, in modern science we have a situation where the amount of time a person has to spend just to bring himself up to speed with an open problem is unacceptably long. I cannot explain - even to a very good student in his final year at University – the details of my work! Today, new people find it harder and harder to engage in the scientific process. I think it’s a bad sign. If mathematics does not turn to the practical needs of mankind, in fifty years it will no longer be in any form we can recognise.

YS: Well, here I’d like to object. I am well acquainted with the history of mathematics, and can say that apocalyptic predictions of its demise are not new. But mathematics, paradoxically, has always evolved in an irrational fashion. Its history is very similar to that of poetry. In some periods there is a crisis, and then there’s a period of barely discernible development in new directions, and then there’s a powerful creative explosion. Forecasting this systematically is impossible. I think than in fifty years mathematics will still exist as a fully-fledged science.

VV: Shall we bet on it? Let’s meet in thirty years, say, and examine the situation. We won’t wait fifty years – who knows if we’ll live that long?

Vladimir and Yuri made the wager, I excused myself. Time passed.

[To be continued.]

[I translated loosely from Olga Orlova's piece on Polit.Ru. It appears that in 2002, when she first wrote it up to link with the International Congress of Mathematicians at Beijing, the journal that had commissioned it, 'New Model', went out of business without publishing it. She and her editors decided that the content was still relevant in 2006, when the Perelman story was appearing in the world's press in the run-up to the ICM in Madrid. The first part is here.]

The first meeting.

Venue - Beijing, August 2002.

We met up with Vladimir Voevodsky and Laurent Lafforgue at the International Congress of Mathematicians - the pre-eminent event in the world of mathematics. The Congress is nothing less than a hybrid between the Olympics and the Nobel Prizes. What it has in common with the former is its quadrennial occurrence, and to present at it is as much an honour as it is for a sportsman to win a medal at the Olympics. And like the Nobel it confers an award, the Fields Medal, which is possibly the greatest prize in mathematics.

We may never learn what occasioned Alfred Nobel so much dislike: mathematics as a discipline, or mathematicians as a community. One thing is for sure, though: he did not declare any share of the prize to mathematicians that might enhance either their prestige or their financial status. Nobel laureates quickly become stars on TV and radio, their bank accounts bulging to the tune of several trailing zeroes; for the rest of their lives, they enjoy the fruit of their labour. Fields medallists, though, are known chiefly to their colleagues, and the prize money itself is so modest that they scarcely have enough to purchase a middling automobile. In addition, there is a severe restriction: the prize can be won only by a mathematician not older than 40 years of age. But none of this diminishes any of the scientific work that is nominated for it. And so the professionals in their thousands descend upon the Congress from all parts of the world, reminiscent of warriors who congregated to measure themselves against each other in ancient times.

In 2002, the Congress held in Beijing was unusual in two ways. It was the first time since the inception of the Fields Medal in 1932 that it was being held in China. Secondly, it was the first time that the prize was being awarded only to two mathematicians, not four as was the usual practice. [My note: this is not true. The first five ICMs had only two prizewinners each, as did the one in 1974.] The quality of achievement of these two men was considered so high that it had been impossible to find another pair equally eminent.

In Beijing, the event had assumed a national importance. I suppose this was no different from the way we conducted the International Festival of Youth in Moscow in 1957. On all TV and radio stations, they transmitted live broadcasts of the events unfolding at the mathematical institute where the Congress was hosted. All manner of strangers, in the markets, on the streets, in the shops, came up and welcomed us when they noticed the badge we wore with the ICM logo. And the prizes themselves were awarded in the great hall of the Chinese parliament by the President, Jiang Zemin. At the centre of all the attention, of course, were two young light-haired Europeans, who looked so alike to the President that he mixed up the medals, and didn't at once realise with whom he should standing to be photographed.

[I translated loosely from Olga Orlova's piece on Polit.Ru. It appears that in 2002, when she first wrote it up to link with the International Congress of Mathematicians at Beijing, the journal that had commissioned it, 'New Model', went out of business without publishing it. She and her editors decided that the content was still relevant in 2006, when the Perelman story was appearing in the world's press in the run-up to the ICM in Madrid.]

In 2006, excitement spilled out of the mathematical community and into the world at large. Scuttlebutt had reached hoi polloi that one of the very giants of mathematics was going to refuse to accept its greatest prizes. In a world where recognition of one's peers is a large part for the reason to exist, this abnegation was nothing short of breathtaking.

Over a period of months between 2002 and 2003, Grigori Perelman had posted three papers on ArXiv that disposed of one of the outstanding problems in mathematics, the Poincare Conjecture. His solution was verified by several other topologists, and it was pretty much taken for granted that the Fields Medal in 2006 would be his for the taking.

Except that Perelman went into seclusion, refused all awards, and pretty much severed contact with his colleagues. For years since, various people tried to approach him to persuade him to return to the fold, or at least accept some tangible form of recognition or the other. He declined everything.

Marcus du Sautoy, in one of his recent TV programmes on mathematics, went to St. Petersburg, and rang Perelman's doorbell. He hoped Perelman might respond to a fellow mathematician, even if he avoided the general public or the press. Sadly, though, Perelman didn't answer the bell. His rift from the community appeared total.

Meanwhile, the Clay Institute was hoping that Perelman would accept the Millennium Prize for solving the Poincare problem, or at least state what he'd like done with the million dollars that came with the prize. Earlier this month, Perelman broke his silence. Here's what he said (in loose translation from the Russian):
I refused the prize. You know that I had many reasons to go that way or another. That is why I took so long to decide. Briefly, there was one chief reason: my opposition to the organisation of the mathematical community. I do not like their decisions, and I consider them unfair. I think that the contribution by Richard Hamilton to the solution of this problem is no less than mine.
Perelman's colleagues believe that he is completely entitled to the honour. Equally, they respect his decision not to accept the Clay Prize. William Thurston, who did so much of the foundational work on the Poincare conjecture and its generalisation, said of Perelman:
Perelman's aversion to public spectacle and to riches is mystifying to many. I have not talked to him about it and I can certainly not speak for him, but I want to say I have complete empathy and admiration for his inner strength and clarity, to be able to know and hold true to himself. Our true needs are deeper – yet in our modern society most of us reflexively and relentlessly pursue wealth, consumer goods and admiration. We have learned from Perelman's mathematics. Perhaps we should also pause to reflect on ourselves and learn from Perelman's attitude toward life.


Check out the following:

1. Sylvia Nasar, David Gruber, "Manifold Destiny", New Yorker, Aug 28, 2006.
2. Interfax, "Последнее "нет" доктора Перельмана", Jul 1, 2010.
3. 'Thomas Paine', "Some Laudations", Libertarianoid blog, Jun 11, 2010.

Jul 26, 2010

Fields! Fields!

In the last mathematical post, I mentioned fields and Deligne. The latter worked on the former, and subsequently won an eponymous award. And so it is time to turn our faces towards John Charles Fields who, by dint of much hard work and perseverance, managed to unify the worlds of mathematics that had been undone by war. The Fields Medal (named, obviously, after JCF) is now considered mathematics' highest honour. Awarded to the finest mathematicians under the age of 40, the next lot of medals will be announced at the 2010 International Congress of Mathematicians in a few weeks' time.

Now I have to say that I don't know too many practising mathematicians. Out of my undergraduate class of about 20 students, as far as I am aware, only three stuck to the field. One is an applied mathematician, another is a teacher, and a third is a pure mathematician. This is not to say that Indians have been laggards at this most intellectual of disciplines. Indeed, from ancient times onwards, the contributions of the Indians have been invaluable and manifold. Somehow, though, no Indian has ever won the Fields Medal.

That may be about to change. Indeed, I hope it does. The next ICM is to be held in Hyderabad, and promises to be a beaut. It is, in fact, only the third time the ICM has been held in Asia, and considering the event occurs every four years, it has been a long wait.

There's the usual politicking that happens behind closed doors, no doubt, about who should receive the Fields Medal. Previous awardees end up in the organisational committees and they might be, however unconsciously, biased towards their students. And so there's a preponderance of European and North American winners. After all, those are the great centres of mathematical research on the planet today.

A few years ago, I recall it was common knowledge in mathematical circles that the odds were on such luminaries as Kontsevich and Borcherds to win the award. And that is exactly what transpired. This time around, there are whispers that Manjul Bhargava might stand a good chance.

Even if he doesn't, we desis needn't despair.
The film The Lord of the Rings had to wait a while before winning a Best Picture Oscar. Bhargava is still quite young, and will remain eligible for the award at the next Congress as well. Properly, he is a Canadian, and will be the first Canadian to win if he does. But he is also of desi origin! And so we too await his ascendancy with bated breath.

Over the period leading up to the next International Congress of Mathematicians at Hyderabad in August, I'm planning to post the occasional article on this mathematician and that result. It's all very stirring, full of vigour and life and spirit.

To start with, take a look at the logo of this congress:


Do you recognise the formula?



It's Ramanujan's conjecture, which I mentioned in a previous article.

How about that, then? The ICM is coming to India for the first time, and what better forum to showcase one of India's greatest geniuses?

Watch this space.

Jul 24, 2010

Examination

What a lovely summer we're having. One should be out and about, having the occasional Pimm's to relax, and possibly taking in the gorgeousness of the English countryside while one's at it. Instead, one is sitting at home surrounded by thick books on regulation, accountancy, large-and-small-economics, and basic statistics.

After around 5.75 years in the financial industry, I have finally decided to take the test that is the basis for certification by the Financial Services Authority as an Approved Person. Whilst I was a lowly Quantitative Person, I had no real need for this qualification: I wasn't directly managing anyone's money. Pension funds, in other words, woke daily with tra-la-las on their ledgers, and central bankers congratulated each other on having, in me, a swot who could do them no harm.

Now, though, I'm expected to shoulder the burden of investment responsibility. I am no longer only a mathematical number-cruncher. I am to be an asset manager. I need to be Approved.

And so, in the midst of the finest summer London's had in years, I am behind closed doors, mumbling annuity formulae and pondering the differences between preference and ordinary shares. Before the middle of August, I will have acronyms coming out of my ears, and I'll be able to tell you the difference between a Lorenz curve and a pie-chart.

Woe, that is to say, is me.

Jul 18, 2010

The Magic of 23

Marcus du Sautoy, publiciser of understanding of science, was recently in Bombay to talk up his latest book The Number Mysteries: A Mathematical Odyssey Through Everyday Life. He visited the Tata Institute of Fundamental Research, that bastion of world-class research in physics and mathematics and biology, where he gave one of his stirring lectures that have made him so popular in high schools and on television everywhere.

Now, academics are a singularly bitchy community, and the mathematicians were upset that du Sautoy, a mathematician, was pitching his talk at the level of a middle-school student, or possibly a bright biologist. The biologists were very pleased, however: they could actually understand his mathematics! He spoke of his twin passions - football and numbers - and, self-deprecating as any Englishman, poked fun at his own club team's abysmal performance. The reason for it, he said, was that their shirt numbers were so humdrum, resulting in their always featuring at the bottom of their league tables.

One year, they decided to assign themselves prime numbers, and they ended up runners-up. Exhilarated by this deep understanding into sports performance, they continued with the prime numbers the next year. Unfortunately, they were beaten by nearly every other team they faced.

Continuing in the vein of prime numbers, he talked about David Beckham's number 23 shirt, and, of course, Michael Jordan's career with the same number. He could not, he said, think of any reason why the number 23, a prime, should be interesting.

One of the mathematicians in the audience felt he should pipe up at that moment to give two reasons for the beauty of the number 23. But he didn't. Instead, he explained it all to me.

If you take the set Q(p) of all numbers of the form , where a, b are rationals, p is a square-free number (i.e., a number without any square divisors), you can show that the set forms what is known as a field. Within this field, you can construct a subset that corresponds to it as the integers do to the set of rationals. The integers have a property called Unique Factorisation. In other words, any integer can be decomposed into a product of primes, and this product is unique. For example, 23 is a prime, and so its unique factorisation remains itself; but 24 = 2 x 2 x 2 x 3, and this is the only way to decompose 24 into primes.

It turns out that there are some values of p such that the set has a subset with the unique factorisation property. On the other hand, there are other values of p for which the factorisation is not unique. The metric of how badly unique factorisation fails is given by a mathematical term called the class number of the field. For fields with unique factorisation subsets, the class number is 1.

It turns out that for small negative values of p, the corresponding class numbers are 1 or 2, or occasionally 4. In fact, it is known exactly when the class number will be even. But Q(-23), the set of numbers of the form has class number 3. This is the first time class number 3 appears. Why does it turn up at -23? What's so special about -23?

(You could ask, though - why not? After all, if the class number can take whatever value (and I'm not saying it does. I'm not saying it doesn't, either. Some mathematician may correct me if they feel like it), it will have to happen at some number. So why at -23?)

The next reason for the surprising qualities of the number 23 has to do with Ramanujan's tau function. We can write one particular expression of a product of powers of q as a sum of powers of q multiplied by the tau function. For example:



That tau function has some interesting properties:

(if m and n are coprime)

And a chap called Pierre Deligne won the Fields medal for (among others) his proof of the following property, which was, according to my pal, conjectured by Ramanujan:



Lehmer conjectured that tau(n) is never zero. It is known, though, that tau(n) can be zero modulo a prime. But the funky thing, where the number 23 gets involved, is in the following property:

tau(p) = 0 modulo 23 for half the primes p.

(It is even known which primes p, but we needn't go into that now.)

So how about that? There's a funky function, which when fed half the prime numbers, results in a multiple of 23.

In fact, as it turns out, this property of the number 23 is closely related to the earlier property we mentioned, namely that Q(-23) has class number 3! Deep connections in the mathematical terra firma, and all that...

I'm not sure if this has anything to do with the fact that in the equation above introducing t(n) we took powers of 24. You know, 24 being right next to 23, etc. My pal wasn't sure if there was any connection. He didn't study smaller powers than 24, he said, because they didn't result in modular forms. 24 was the first power of any interest at all to him, and it had this neat property.

Too bad he didn't mention all this to Marcus du Sautoy. Perhaps the good professor can address these and other interesting facts about the number 23 at a future lecture?

Jul 17, 2010

Scam

Yesterday I got an email from a fellow blogger saying he was in London, and had been mugged, and was upset by it all, and couldn't get any help from the police, and was late for his flight back. Only days earlier I had had emails from him, and he hadn't told me he was going to be here. But what if it had been a last minute trip? So I wrote back asking if he was all right, and if I could help in any way.

The response was prompt. He had internet access only, he said, as his phone and wallet had been stolen. Thanks for writing back, he said. If you can send me £1271, that would cover the hotel bill, and the taxi fare to the airport.

Hmm, I thought, this is serious. Which hotel are you at? I asked. Royal Park, he said. Have you checked out? I said. No, he said. I called the hotel and asked to be connected to him. They had no person by that name staying there, either yesterday or in the past several days.

Aha, I thought. The man's email's been hacked. A scamster on my hands! I rubbed them with glee. If you can send the funds by Western Union, he said, I promise to pay you back when I get home. Let me know if you are sending the money now?

Sure, I said. Which Western Union location will you be at? The bloody fool sent me an address in Wales. I cooked up a Western Union confirmation number and sent it to him. I'm checking online, he said, but the number is not recognised. Can you send me your details?

Western Union told me that all you'll need is the confirmation number, and your ID, I said.

Then I called Maddy. He, of course, was still in the US, fielding calls from frightened pals all over the world. He told me that the scamster had been quite fiendish in his hack. Not only had the villain changed the password, he had changed all the other secondary identifications that the owner could use to reset the email account.

An hour or so later, Maddy managed to re-establish control over his email, and sent an email asking everyone to disregard it.

Ooh, I replied. You ruined it just as I was having fun with the bugger.

Later I got a slightly urgent email from the scamster. It was timestamped before Maddy got his account back.

I went to the Western Union office, said the blackguard. They told me there was no such confirmation number. Please check and let me have the correct one.

I sure do hope he trekked across to Prestatyn to get the moolah. That would be a small mercy for all the angst he caused.

Jul 4, 2010

Not A Drop To Drink

Now that we've had about two weeks of great sunshine, it appears that the country's reservoirs are running out of water. The causation is not as cut-and-dry as I make it out in the previous sentence - the first five months of this year produced less rainfall than expected. Any moment now we'll have hosepipe bans, and people taking baths together to save water.

Sex-y.

While the sun-starved natives of this land flock to the beaches, those of Asian or African persuasion stick to the shade. We understand at a subliminal level the power of the sun, and we avoid stepping out during the hottest hours. Or, if we do, we wear enormous hats and carry floppy fans.

We are wimps, though. The temperature in London recently touched 31 degrees Celsius, positively balmy compared to the searing heat of Delhi that I spent many years in. I didn't think twice before stepping out to do whatever I needed to even in 45 degrees. Without a hat. Or sunscreen. Or shades. Or even a bottle of water. Here, after spending scarcely twenty minutes in the sun, I begin to feel parched, and shortly thereafter, the beginnings of a headache.

Wimp.

My boy's summer vacations have started. Because he'll drive us batty if we spend more than a few hours with him (he needs people of his own age, I am informed), we have arranged a sports camp for him. The last time he spent a whole day out in the sun was a couple of weeks ago during his school's sport day. It was a hot (English) day, and most of the kids wilted, even him. I wonder how he'll take to five days of running about in the same heat.

We are told that the organisers will frequently hose down the kids. It's all a game, we hear.

So we'd better fervently hope that the hosepipe ban is not passed in the coming week.