Watch mathematician and entrepreneur Anne-Marie Imafidon MBE explain binary numbers. Anne-Marie studied for an MSc in mathematics at Oxford University, and founded the social enterprise Stemettes to encourage more women and girls into STEM careers.

## You're reading: Posts Tagged: computing

### Bletchley Park Turing First Day Cover

For my recent birthday I was given a wonderful present: a special UK stamp commemorating Alan Turing, who was born 100 years ago today. The stamp was issued by the Royal Mail not for the Turing centenary but as one of a series of special stamp sets to mark the Queen’s Diamond Jubilee.

This stamp is particularly special because it is one of 1000 which originated at the Bletchley Park Post Office that were stuck onto a specially designed envelope (Turing, mathematics and patterns) and cancelled on the day the stamp was issued, 23 February 2012, using a special Bombe-themed postmark.

### Tony Mann to lecture on ‘Computing Mathematics’ at Gresham College

Tony Mann from the University of Greenwich has been appointed Visiting Professor of Computing Mathematics at Gresham College, London. This means he will deliver a

series of free public lectures will look at the mathematics of computing, and the computing of mathematics. The lectures will consider what can go wrong, how computers sometimes get the wrong answer, and the ingenuity mathematicians have used in overcoming these inherent problems. Since Gresham Professors such as Henry Briggs, Edmund Gunter and, more recently, Louis Milne-Thomson were pioneers in the mechanisation of computation, he is especially pleased to address these subjects at Gresham College.

### Historical anniversaries: are they worth celebrating?

It probably hasn’t escaped your attention that this year marks 100 years since Alan Turing was born, and that the actual anniversary of his birth is tomorrow. There is massive interest in this fact, both from specialist maths and computing outlets and the mainstream press. What, though, is the significance? You don’t need me to tell you that any anniversary is fairly arbitrary. The earth has gone a whole number of times around the sun since the event (within some margin of error). What, really, does this mean? And attributing special interest to one particular number of anniversaries just because it is a factor of ten or a neat fraction of one hundred is wholly meaningless.

So I don’t fall for anything like that, right? Wrong. For a couple of years now I have been tweeting a link to a biography of a mathematician who was born or died on each date to the Twitter feed @mathshistory on behalf of the British Society for the History of Mathematics. This generates some interest and I am delighted when it does so.

So can I justify anniversaries as having some tremendous significance or is this all just a cynical attempt to grab attention? To a great extent it is the latter. BSHM have a charitable aim to “promote and develop for the public benefit, awareness, knowledge, study and teaching of the history of mathematics”. If anniversaries are going to generate greater awareness of and interest in history, then I’m in.

For the daily tweeting I rely entirely on the excellent MacTutor History of Mathematics archive (so much so that some people think I run the site, or MacTutor runs the Twitter feed).

Basically, I choose a mathematician who was born or died on each day according to a bunch of constraints. People sometimes tweet and say “why have you chosen X; what about Y?”

The basic ground rules are: one tweet per day, each mathematician once per year. This causes some conflicts that people don’t naturally understand. For example, on 23rd January I tweeted about James Lighthill, who MacTutor describes as “one of the foremost English applied mathematicians of his day”. Why, wondered Twitter user @gemmarobles, was I ignoring David Hilbert, also born that day? Well, I included Lighthill on his birthday because he died on the same day that Lexis was born, who MacTutor report as “initiating the study of time series”. And Lexis died on the day Galois was born. And although there are a few mathematicians who were born or died on 14th February, when Hilbert died, there is no clear issue with placing Hilbert on that day. So why did I choose Lighthill over Hilbert? Because Galois was born on the day Lexis died. At some point, an arbitrary decision needs to be made and this has consequences down the line.

Apart from these basic constraints, I have a bunch of extra rules. I am doing this to try to generate interest, so I try include some variety. I like to try to tweet from different eras and different mathematical areas on adjacent days if possible. I favour time periods when few dates are known or cultures without many mathematicians in the database because these have fewer opportunities to get picked. I also think it is good to highlight women in mathematics or other important issues such as race or disability, again if possible. It is also pleasing to make people aware of the mathematical contributions of mathematicians who are better known for something else, or people who were not principally mathematicians but made a contribution. Anyone who meets some of these criteria might see favour over other mathematicians associated with the same day.

Still, much as I like to include mathematicians that people won’t know and highlight time periods and issues they haven’t thought about, it is the big hitters, Euler and Gauss and other well known names, who get the large numbers of retweets and interest. So I include them because that is how followership of the account grows and links to maths history content spread. If people are only going to take an interest on a famous anniversary, at least they are taking an interest at all.

Do I think the world has gone over the top on Turing? I do think there is value to be had. Leveraging Turing’s name and the interest generated by his centenary to attempt to do some good for gay rights is a noble undertaking (although I have my doubts over the precise details). Using Turing to try to generate extra interest in the history of mathematics, cryptography and computing is worthwhile. If we aren’t going to get people’s attention at the big 100, when will we? I remember seeing a lecture by Robin Wilson where he lamented the relative lack of interest in the 300th anniversary of Euler’s birth in 2007, which could have been a great opportunity to raise the profile of mathematics in wider culture. It’s clear to see why the 305th anniversary this year just hasn’t got the same traction.

However, I worry about the others involved with the war work at Bletchley Park or the early development of computers who are getting eclipsed, and, for that matter, all the other history of maths and computing stories that are worth telling but can’t get the attention. Celebrating the big names supports the idea that advances are made in giant leaps by great men (mostly men), whereas history is constantly being made in small steps. On top of this, I worry that the attention people are giving Turing is fairly superficial. People aren’t, I think, gaining a wider understanding of the historical context into which Turing fits, or of the place of mathematics research in our culture. And I worry that this interest won’t be sustained. What happens in the cold light of Sunday morning when it’s all over? Perhaps we can sustain some interest until the end of the centenary year but will ‘Turing100’ have a lasting impact on people’s minds? Turing died in 1954. Will we ignore him again until 2054?

Anyway, must dash. I have to draft my exciting Turing centenary day post for tomorrow.

### Happy π day

People celebrate today as “π day“, an official designation in the US^{*}

3.141592653589793238462643383279502

88419716939937510582097494459230781

64062862089986280348253421170679821

48086513282306647093844609550582231

72535940812848111745028410270193852

110555964462294895493038196...5...

Do you know how we know those digits? If you’d like to find out, I’ve written a blog post over at Second-Rate Minds: “How to calculate π“.

* This is not necessarily the best day. “3.14” is a very crude approximation for π and translating 14th March into this number requires a month/day dating system. 22/7 gives 22nd July in day/month format and gives a slightly closer approximation for π: 3.142857… (3.14 is π-0.00159…, while 22/7 is π+0.00126…). Having said that, 14th March has the tantalising prospect of 1:59 and 2.65359… seconds giving an actual value of π… Perhaps we need a fourteenth month…