Not dead

Sorry for going so quiet.

Holiday YouTube. This blog causes fascists to limp slightly

I’ve had a decidedly ungood Friday. Made the mistake of going to office. Network borked. Then I got lost in an underground car park (no I don’t drive don’t ask).

Anyway the “proper” understandings of what the holiday is held to mark always left me bit cold but Woody’s version connects for me.

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The truth about mathematics.

I often read paraphrases of one or other of Gödel’s theorems that talk about true, unprovable statements. I’ve said before that I’m a formalist of sorts. Talk of undecidable statements in a system being true gives me headaches. And I’m an analyst so I work in ZFC. If I say “statement X is true” I’m telling you that there exists a proof of statement X in ZFC. If you ask me if I think the continuum hypothesis is true, I’ll explain to you that it’s known to be undecidable. If you tell me you know it’s undecidable but still want to know if I think it’s true, I’ll look at you as if you asked me what colour integrity is.

Carnival of maths 38 is up

And they link to me w00t!

This is kind of delayed I know; I’ve been away.

Lockhart, Jenkins and compulsory maths

I meant to post about this forever ago but I was kind of busy. I’m going to be talking about maths in school. I have very little teaching experience and none at a level below undergrad, so I’ll mostly be talking about how I wish I’d been taught.

Simon Jenkins’ doesn’t really know what maths is and thinks very little is lost by kids not doing it. Yemon Choi gave him a good kicking for that at the time, and he deserved it. Apart from his blinding arrogance about his own knowledge of the subject, he was happy to push a line of “It’s hard and the kids won’t need it so we should let it go” which I find it hard to believe he would be happy to apply to the works of Shakespeare, or to foreign languages (everyone speaks English these days, right). He implied that the only arguments for the importance of maths were (bad) economic ones or conservative calls for the brain to be beaten into shape, of the sort once used for arguing for teaching Latin. Well, no. There is very good argument for maths teaching as a path towards being able to share in the beauty of the subject. I believe that being familiar with a few proofs (infinity of primes, irrationality of root 2…) and having some concept of what makes them proofs (not too refined a concept, because I don’t think the philosophers of maths have settled on one) ought to on the list of things needed if you wish to call yourself “educated” or “cultured” just as being familiar with a few poems and knowing what makes them poems is.

Despite all this, there was (weirdly) the skeleton of a defensible position in Jenkins’ nonsense. First what I was taught in maths up to GCSE (Sir Simon’s “advanced” quadratic equations and such) really wasn’t the route to sharing in that beauty. It was an awful lot of memorizing algorithms for solving artificial and formulaic problems. I learned how to multiply matrices without knowing that it was composing any kind of function; just remember it’s rows by columns. It was kind of dull. and it makes maths seem boring, and mechanical and all the bad things that people think it is but it isn’t. It got slightly better at A-level but that was more down to good teachers than the curriculum. So yes, a lot of “maths” in schools could be cut away and I’m prepared to believe that neither students, nor the sciences, nor maths itself would suffer.

Another thing in Jenkins’ favour was mentioning Innumeracy by John Allen Paulos and Hardy’s apology. These are books you should be thinking of it you want to cut the tiresome, repetitive nonsense out of maths education. Unfortunately, Jenkins’ views on them were EPIC FAIL. He claimed that Paulos’ recommendation of a good knowledge of probability and statistics to avoid being tricked by numbers from pseudo-scientists, advertisers and politician came down to “simple concepts applied to daily life”. Well not really. Thinking critically about numerical data, knowing what they really tell you and what is random noise or sleight or hand, is something people are naturally VERY BAD at. Our brains didn’t evolve in a setting where big numbers were much of an issue; we can’t get a good intuition of them. That’s why national lotteries exist. It’s also why bad science reporting is so common and thus why Ben Goldacre is so frikkin awesome. So if we are going (collectively) to take Paulos cure for the con men it’s probably going to mean lots of class time.

Jenkin’s on Hardy was bad in a more subtle way. Surprisingly for someone so proud of his training in the humanities he took the Apology altogether too much at face value. It’s a lovely book, but it’s very much A Mathematicians Apology, a personal account of how one mathmo worked. Jenkins’ treats it as a description of all mathematics and thus is able to shrug the subject away as a game done for pleasure by men in ivory towers. Maths includes many things which are very useful. What the Apology shows (better than any other book I’ve read) is that it is also a beautiful, pleasurable activity. This brings me back around to where I started; it’s a shame if this beauty isn’t shared.

American teacher Paul Lockhart’s essay A Mathematician’s Lament gives a plausible way of actually sharing it. Instead of long hours of compulsory drilling in algorithms for solving simultaneous equations teach maths like music. Have a specialist maths teacher, who has actually DONE maths – not just learnt more of it a college, but done some – go from class to class doing little bits of maths with small groups. Show them how you make a conjecture, how you look for counter-examples and find simple proofs. By this method he had a 12-or-13-year-old come up with there own argument why a triangle drawn inside a semicircle always has a right angle; that AWESOME!!!1 He also say that if they really don’t respond to the patterns and proofs of mathematics they shouldn’t be forced to keep doing it because nothing kills the joy of creativity like a compulsory class (He doesn’t mention exempting stats and probability from this; I would since they are more “life skills” than a creative subject).

So, the maths Simon Jenkins did at school probably was as pointless as he said and many of the arguments given why it matters are asbad as he says- but he’s still a clueless arse.

In which I agree with Felipão Scolari

Since I am know on someone’s blogroll (thanks Yemon), I think I should have some content. I am not going to post about maths right now though; I’ll have the slides for my upcoming talk here when they are done but now I’m going to talk about a football coach and names.

Now, I don’t much care for Luiz Felipe Scolari. He is kind of violent. He says stuff like “If I found out that one of my players was gay I would throw him off the team.” . He admires Augusto Pinochet. He encourages players to put special pebbles in their socks for luck. He seems to really under-value Nani. Above all, he’s now manager of Chelsea football club (bad enough in itself) and seems to have misused his role as Portugal coach to help Chelsea (encouraging Ronaldo to leave ManU and Bosingwa to go to Chelsea).

Anyway he is right about something. Namely his name. As he told the Torygraph, his name is not “Phil”. It’s “Felipe”. And in related news, my name is not “Mateus”. About a third of the people I am introduced to here in Portugal feel the need to tell me that here “Matthew” is “Mateus”. Well, it isn’t. That’s my NAME you are messing with. I’m not a king, or a pope, therefore my name does not translate.
Thanks.

Video you say?

Test with Flaming Lips reworking of Gnarls Barclay

LaTeX

Don’t know how I got that wrong but it works now. I give you, The Essence Of Analysis:

Let .

Post doc!

Well, I haven’t really used this so I guess no one is reading but just while I am here, I thought I’d mention that I have finally started a post doc at the Centre for Functional Analysis and Applications at IST in Lisbon. I have a fellowship funded by the good people at the Portuguese Foundation for Science and Technology. I’ll put some stuff up about the project sometime, maybe.

Hello world!

I’m more or less just playing with WordPress right now. I might start putting some discussions of maths though. In particular, functional analysis doesn’t seem to be covered much in blogs so maybe I can fill a bit of a gap. Unless you want to employ me to do research. In that case I’ll be too busy.