Archive for mathematics

The most beautiful equation?

Posted in The Universe and Stuff with tags , , , , on February 13, 2014 by telescoper

There’s an interesting article on the BBC website today that discusses the way mathematicians’ brains appear to perceive “beauty”. A (slightly) more technical version of the story can be found here. According to functional magnetic resonance imaging studies, it seems that beautiful equations excite the same sort of brain activity as beautiful music or art.

The question of why we think equations are beautiful is one that has come up a number of times on this blog. I suspect the answer is a slightly different one for theoretical physicists compared with pure mathematicians. Anyway, I thought it might be fun to invite people offer suggestions through the comments box as to the most beautiful equation along with a brief description of why.

I should set the ball rolling myself, and I will do so with this, the Dirac Equation:

dirac_equation

This equation is certainly the most beautiful thing I’ve ever come across in theoretical physics, though I don’t find it easy to articulate precisely why. I think it’s partly because it is such a wonderfully compact fusion of two historic achievements in physics – special relativity and quantum mechanics – but also partly because of the great leaps of the imagination that were needed along the journey to derive it and my consequent admiration for the intellectual struggle involved. I feel it is therefore as much an emotional response to the achievement of another human being – such as one feels when hearing great music or looking at great art – as it is a rational response to the mathematical structure involved. But it’s not just that, of course. The Dirac Equation paved the way to many further developments in particle physics. It seems to encapsulate so much about the behaviour of elementary particles in so few symbols. Some of its beauty also derives from its compactness.

Anyway, feel free to suggest formulae or equations through the comments box, preferably with a brief explanation of why you think they’re so beautiful.

Pseudospheres Corner..

Posted in Cute Problems with tags , , , , on November 28, 2013 by telescoper

I’m sure you have all seen a knitted pseudosphere, but this is a particularly fine collection made by the excellent Miss Lemon and briefly displayed in my office this morning.

IMG-20131128-00223

A pseudosphere is a space of negative curvature (whereas a sphere is one of constant positive curvature). There are various ways to realize a two-dimensional surface which has negative curvature everywhere; this knitted version is based on hyperbolic space. If you’re keen to have a go at making one yourself you can find some instructions here. I’m advised, though, that the better way to approach the task is to start out with a large circular ring onto which you cast about 400 stitches, gradually working your way in with fewer and fewer stitches (say 400,200,100,50 etc), which is much easier than working outwards as described in the link. The folds and crenellations are produced quite naturally as a consequence of tension in the wool.

Happy knitting!

Advice for Students on Clearing

Posted in Education, The Universe and Stuff with tags , , , , on August 15, 2013 by telescoper

1-dont-panic

We still have places in the School of Mathematical & Physical Sciences at the University of Sussex. No other Physics & Astronomy department in the UK scored more highly in the latest NSS survey than ours, so whether you’re interested in Physics, Astrophysics, Astronomy or Mathematics (or even a combination of those subjects), why not just take a look at the University’s Clearing Page and give us a ring.?

As a matter of fact, I’ll be there myself from 8am this morning to talk to interested students.

11.30 UPDATE. I finished my first shift at 11am. I’ll be going back at 5pm for the last session, until the lines close at 7pm. During the last hour a minimum of 20 overs must be bowled. Or something.  The main call centre (which has fifty phone lines) is next door to where we were sitting and is operated by admissions experts and student helpers who are processing the queries and, if necessary, routing them through to academics (i.e. people like me) to provide further information or to answer specific questions. You can take a peep behind the scenes here. Some of the calls were from very anxious prospective students, and it’s a very nice feeling being able to help them sort out their course! Now back to other things until I start again this evening.

 

19.30 UPDATE. Phew. Finally been stood down, but I’ll be back on duty tomorrow afternoon. It’s been a very interesting day which has gone very well for us. Lines stay open until 8pm tonight and re-open at 8 in the morning and we’re still in business to see if we can give just a few more students the opportunity to study in the School next academic year. Now I’m off home to chill, probably over a glass or two of wine!

(Lack of) Diversity in STEM Subjects

Posted in Science Politics with tags , , , , , , on May 10, 2013 by telescoper

Among the things I learnt over the last few days was some interesting information about the diversity (or, rather, lack of diversity) of undergraduates taking undergraduate degrees in STEM subjects in the UK universities. For those of you not up on the lingo, `STEM’ is short for Science, Technology, Engineering and Mathematics. Last year the Institute of Physics produced a report that contains a wealth of statistical information about the demographics of the undergraduate population, from which the following numbers are only a small component.

Physics

Maths

Chemistry

Engineering

Female

21%

41%

44%

12%

BME

11%

24%

20%

30%

Socio-Economic

37%

42%

43%

51%

Non-EU

5%

12%

7%

32%

For completeness I should point out that these numbers refer to first-year undergraduates in 2010-11; I have no particular reason to suppose there has been a qualitative change since then. “BME” stands for “Black and Minority Ethnic”, and “Socio-Economic” refers to students whose with parents not employed in managerial or professional positions.

Overall, the figures here at the University of Sussex are roughly in line with, but slightly better than, these national statistics; the proportion of female students in our Physics intake for 2010/11, for example, was 27%.

There are some interesting (and rather disappointing) things to remark. First is that the proportion of Physics students who are female remains low; Physics scores very badly on ethnic diversity too. Mathematics on the other hand seems a much more attractive subject for female students.  Notice also how Physics and Chemistry attract a very small proportion of overseas students compared to Engineering.

In summary, therefore, we can see that Physics is a subject largely studied by white  middle-class European males. What are we doing wrong?

Despite considerable efforts to promote Physics to a more diverse constituency,  the proportion of, e.g., female physics students seems to have been bumping along at around 20% for ages.  Interestingly, all the anecdotal evidence suggests that those women who do Physics at University do disproportionately well, in the sense that female students constitute a  much larger fraction of First-class graduates than 20%. This strongly suggests that the problem lies at school level; some additional IOP information and discussion on this can be found here.

I’m just passing these figures on for information, as I’m quite often asked about them during, e.g., admissions-related activities. I don’t have any really compelling suggestions, but I would like to invite the blogosphere to comment and/or make suggestions as to promote diversity in STEM disciplines.

Advice for Prospective Physics Students

Posted in Education with tags , , , , , , , on February 25, 2013 by telescoper

Just got time for a quickie this morning before I head up to the Big Smoke for the first meeting of the Astronomy Grants Panel of the Science and Technology Facilities Council (STFC). I had thought that the last round would be my last, but I must have misbehaved somehow and my sentence has been extended accordingly.

Anyway, I thought I’d follow up Saturday’s post with a response to a question that a few prospective Physics students asked me during our Admissions Day. Those attending these days have already applied to this University but, at this stage of the annual undergraduate admissions cycle, the applicants are still deciding which University to put as their first or firm choice. I see our job in the Admissions Days simply to make available as much information as possible to the applicants to help them make a choice. Quite a few people I spoke to on Saturday, however, said that they had already made up their minds and just wanted some advice about what to do during the summer after they have finished their A-levels to help them prepare for their undergraduate studies in Physics (and/or Astronomy).

The answer I gave was pretty simple: practice your mathematics, especially your calculus! 

The justification for exhortation is that the big difference between Physics at A-level and Physics at undergraduate University level is that the latter is taught in a much more mathematical way than the former. This is because the physical laws that underpin our understanding of the natural world are expressed in a mathematical language; the more fluent you are in this language the easier you will find it to assimilate the physical concepts. To put it another way, you will find it difficult to understand the physical meaning of what is being taught if you are struggling with the mathematical meaning of the symbols being used or the manipulations needed to obtain useful solutions to the relevant equations.

Newton’s Second Law, for example,  relates the rate of change of momentum of a body to the force exerted upon it. If you’re comfortable with calculus you don’t think twice about writing d(mv)/dt for the rate of change of momentum and then constructing a differential equation which you can (hopefully) solve. You won’t absorb the importance of laws like this unless you become so familiar with the mathematics that it ceases to occupy the part of your mind that’s needed to really think.

I think that learning to do Physics is a bit like learning to play a musical instrument. Practicing such basic mathematical procedures as integration and differentiation is analogous to the five-finger exercises you have to do when learning to play the piano. The more you practice them, the greater the extent to which they become hard-wired. Your brain can therefore concentrate on the more interesting conceptual stuff – that’s really the hard part of learning Physics. We do of course do as much as we can to help with this once you’ve got to University, but doing some preparation on your own beforehand would greatly smooth the transition.

So I’d tell any prospective physics student wondering what to do this summer to get hold of as many basic calculus exercises as they can and do them whenever they get the chance. It may not be the most exciting way to spend your post A-level holiday, but it is the single thing you can do that will best prepare you for life as a Physics student.

On the other hand, the advice I’d give to physicists rather later in their careers is to think very carefully before agreeing to be on committees or panels…

Society Counts, and so do Astronomers!

Posted in Bad Statistics, Science Politics with tags , , , , , on December 6, 2012 by telescoper

The other day I received an email from the British Academy (for Humanities and Social Sciences) announcing a new position statement on what they call Quantitative Skills.  The complete text of this statement, which is entitled Society Counts and which is well worth reading,  is now  available on the British Academy website.

Here’s an excerpt from the letter accompanying the document:

The UK has a serious deficit in quantitative skills in the social sciences and humanities, according to a statement issued today (18 October 2012) by the British Academy. This deficit threatens the overall competitiveness of the UK’s economy, the effectiveness of public policy-making, and the UK’s status as a world leader in research and higher education.

The statement, Society Counts, raises particular concerns about the impact of this skills deficit on the employability of young people. It also points to serious consequences for society generally. Quantitative skills enable people to understand what is happening to poverty, crime, the global recession, or simply when making decisions about personal investment or pensions.

Citing a recent survey of MPs by the Royal Statistical Society’s getstats campaign – in which only 17% of Conservative and 30% of Labour MPs thought politicians use official statistics and figures accurately when talking about their policies – Professor Sir Adam Roberts, President of the British Academy, said: “Complex statistical and analytical work on large and complex data now underpins much of the UK’s research, political and business worlds. Without the right skills to analyse this data properly, government professionals, politicians, businesses and most of all the public are vulnerable to misinterpretation and wrong decision-making.”

The statement clearly identifies a major problem, not just in the Humanities and Social Sciences but throughout academia and wider society. I even think the British Academy might be a little harsh on its own constituency because, with a few notable exceptions,  statistics and other quantitative data analysis methods are taught very poorly to science students too.  Just the other day I was talking to an undergraduate student who is thinking about doing a PhD in physics about what that’s likely to entail. I told him that the one thing he could be pretty sure he’d have to cope with is analysing data statistically. Like most physics departments, however, we don’t run any modules on statistical techniques and only the bare minimum is involved in the laboratory session. Why? I think it’s because there are too few staff who would be able to teach such material competently (because they don’t really understand it themselves).

Here’s a paragraph from the British Association statement:

There is also a dearth of academic staff able to teach quantitative methods in ways that are relevant and exciting to students in the social sciences and humanities. As few as one in ten university social science lecturers have the skills necessary to teach a basic quantitative methods course, according to the report. Insufficient curriculum time is devoted to methodology in many degree programmes.

Change “social sciences and humanities” to “physics” and I think that statement would still be correct. In fact I think “one in ten” would be an overestimate.

The point is that although  physics is an example of a quantitative discipline, that doesn’t mean that the training in undergraduate programmes is adequate for the task. The upshot is that there is actually a great deal of dodgy statistical analysis going on across a huge number of disciplines.

So what is to be done? I think the British Academy identifies only part of the required solution. Of course better training in basic numeracy at school level is needed, but it shouldn’t stop there. I think there also needs to a wider exchange of knowledge and ideas across disciplines and a greater involvement of expert consultants. I think this is more likely to succeed than getting more social scientists to run standard statistical analysis packages. In my experience, most bogus statistical analyses do not result from using the method wrong, but from using the wrong method…

A great deal of astronomical research is based on inferences drawn from large and often complex data sets, so astronomy is a discipline with a fairly enlightened attitude to statistical data analysis. Indeed, many important contributions to the development of statistics were made by astronomers. In the future I think we’ll  see many more of the astronomers working on big data engage with the wider academic community by developing collaborations or acting as consultants in various ways.

We astronomers are always being challenged to find applications of their work outside the purely academic sphere, and this is one that could be developed much further than it has so far. It disappoints me that we always seem to think of this exclusively in terms of technological spin-offs, while the importance of transferable expertise is often neglected. Whether you’re a social scientist or a physicist, if you’ve got problems analysing your data, why not ask an astronomer?

In the Dark on Youtube

Posted in Education with tags , , , on November 12, 2012 by telescoper

Once again I find myself too busy to do a substantial post this lunchtime. However, I’ve been rescued by  Prof.  Philip Moriarty who tipped me off about the following video from the series “Sixty Symbols” which features this blog in a supporting a role as a source of old examination papers. The theme is the dire state of mathematics education in British schools, something I’ve moaned about on many occasions myself, so I thought I’d post it here. You’ll get a flash of my organ  about 6 minutes and 15 seconds  into the clip, so if you don’t want to see it please watch with your eyes closed.

Part IB Maths for Natural Sciences, from 1984

Posted in Biographical, Education with tags , , , , on October 7, 2012 by telescoper

I’ve been rummaging through my old second-year undergraduate notes and papers trying to compare what I did when I was a student with what we’re asking current second-year undergraduates to do. Since I’m now teaching a fairly mathematical second-year course, it is interesting to look at how the content compares with the Mathematics papers I took way back in 1984.

Looking at these two examinations it’s clear that some of the content is similar (e.g. vector calculus, Fourier transforms) but some big things are entirely missing from our second-year syllabus, specifically Laplace transforms and group theory. The absence of the latter is a matter of particular regret because it’s such a beautiful subject that I think leads onto a deeper understanding of physics than a lot of the other things we make the students learn.

The other striking thing is that the marks for different bits of the questions are not given. That was standard in my day, but nowadays we usually indicate how many marks are available for each part. Moreover, the style of examination is such that even the number of correct answers needed for full marks isn’t given; it just says “You are advised to answer complete questions rather than fragments”.

Anyway, as usual, I’d be interested in comments on the content and difficulty especially from current students in the unlikely event that they have nothing better to do on a Sunday afternoon than have a look at it! For my part, I’ll be in the department getting next week’s lecture materials sorted. Heigh-ho.

More Maths, or Better Maths?

Posted in Education with tags , , on July 25, 2012 by telescoper

Interesting view from a Biosciences perspective about the recent recommendations to increase the number of students taking Mathematics at A-level.

I’ve always had a problem with the way Statistics is taught at A-level, which is largely as a collection of recipes without much understanding of the underlying principles; would more emphasis on probability theory be a better way to go?

JennyAKoenig's avatarBiomaths Education Network

The introduction of post-16 maths is in the news again with a report from the House of Lords committee on Higher Education in STEM and many of the headlines from the Guardian, Independent and Times Higher  have picked up on the recommendations regarding maths study post-16.

I have written a few thoughts here on my first impressions but would very much welcome comments.

Though I was pleased to see that some of my work showing that only GCSE maths is required for undergraduate biosciences was cited, the conclusion from this was that more students should take maths A level and this is a little worrying.

The lack, or low level, of maths requirements for admission to HEIs, particularly for programmes in STEM subjects, acts as a disincentive for students to take maths and high level maths at A level. We urge HEIs to introduce more demanding maths  requirements…

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Cambridge Entrance Examination – Mathematics for Natural Sciences (1981)

Posted in Biographical, Education with tags , , , on February 7, 2012 by telescoper

I thought I’d take 5 minutes this lunchtime to add another item to the collection of old examination papers I’ve been posting, as someone asked me about this type of examination via a comment recently. This is the Mathematics paper I took way back in November 1981 for entry the following October to do Natural Sciences. I also took papers in Physics and Chemistry, as well as a General paper. Looking at this after a gap of over 30 years it looks pretty tough. One thing I should point out, though, is that the timing of the paper required us to come back after A-levels for an extra term (“the seventh term”)  at my school, the Royal Grammar School in Newcastle,  to form the “Third Year Sixth” who were all Oxbridge candidates. We were then intensively coached for the entrance examination. You will notice, for example, a couple of questions on this paper relating to group theory, which wasn’t on the A-level syllabus but which we were taught specifically for this examination. Some schools couldn’t offer this specialist teaching so pupils from them were significantly disadvantaged by this form of selection. As it happens, I answered both the (relatively easy) questions on group theory and got in to Cambridge…

Comments on the content and/or difficulty are welcome through the box below!