This morning a story on slashdot linked to A Mathematician’s Lament by Paul Lockhart as well as a blog post discussing the issue. This is the first time I’ve read Lockhart’s rant but little of what he said was new to anyone who has listened to any of the mathematicians vocally crusading for better mathematics education. As usual most of his piece was the same unrealistic claptrap about how if we could only show the children the joy and beauty of math all would be well. It’s a pleasant fiction to believe, and it’s seductive to think that with just one little nudge all children could discover the pleasure we take in mathematics, but it’s about as reasonable as believing everyone would love to garden, read Shakespeare or anything else if they were only exposed to it.

To be fair I was quite impressed with Lockhart’s brutally frank analysis of what currently passes for mathematical edification in K-12. Apart from teaching kids to sit still and signaling social status¹, for 95% of the class everything after multiplication (and a good bit before) is totally pointless. Go talk to some doctors (GPs), lawyers, managers, etc.. to solve a simple algebra problem (say two linear equations in two unknowns) and see just how few have the slightest clue. No one’s benefiting by making them rotely memorize some rules they promptly forget. However, the notion that if we only taught children real math they would gobble it up is simply absurd.

I remember taking a differential geometry class in college that was taught in what was (at least for me) an abominable way. No rigor, just vague comments about pictures and twisting so unsurprisingly I kept putting that homework off and gradually falling further behind. At that point understanding became nigh impossible. Just doing the problem sets made me feel frustrated, angry and perhaps a bit inferior and I’m unreasonably over confident about my mathematical abilities. Naturally one then puts them off and when you force yourself to work you just grind through the problems without any curiosity or hope of understanding the bigger picture. Psychologically you just can’t force someone to be curious and deeply thoughtful about a subject that makes them feel bad and that’s what understanding math requires. So certainly a sufficently bad teacher (who won’t follow a book) can discourage real learning but could better teaching really significantly encourage real mathematical understanding in K-12?

Sure if you somehow eliminate the social significance of mathematical ability and turned math class into a non-threatening fun activity like most HS art classes you might make some progress. That, however, is simply impossible. Nothing the teacher says can erase the knowledge that actually showing interest and talent in mathematics opens up many lucrative doors and signals intelligence. So long as the mathematically gifted are financially rewarded students (and their parents) will care about how they perform in the subject. Unlike art or literature math also has right and wrong answers and can often leave one feeling lost and frustrated so unavoidably half your student body will resent math for making them feel stupid and inferior even if they would never admit it. No matter how excellent the teacher they can do no more than try to distract the under performing students from inevitable comparisons with those who are doing better. Worse, any attempt to discourage people who dislike the subject from taking the courses will simply increase the incentive for them to camouflage themselves as someone who does like math to future schools and bosses. The problem would be a lot easier if it was just that some people weren’t smart enough.

I don’t really know what we should do about this situation. However, I suspect one reason people are so reluctant to face this possibility is that it would require us to explicitly consider how we want to trade off the benefit to the small fraction students who could benefit immensely from non-rote proof based mathematics and in turn contribute disproportionately to our economic growth against the interests of the larger number of students who are too intimidated by the subject to do anything but rote work. I think we ought to consider using programming, with it’s more video game/slot machine pace of rewards, as the means to teach logic and quantitative thought but that still doesn’t answer the math question.