This month’s MathsJam was well attended – we matched last month’s turnout of 11, albeit one of that number was in the form of Ed Bradshaw, the organiser of the Washington DC MathsJam. For Ed, it was 4pm and he was in his office, using Google Plus for a live video connection to a MathsJam halfway around the world. The video connection worked fine, although in a noisy pub we struggled to hear what Ed was saying on my laptop’s tiny speakers, so for some of the evening we used headphones and took it in turns to be in conversation with Ed.
You're reading: Columns
- London: tic tac toe puzzles
- Newcastle: mathsjammers deep in concentration
- Newcastle: trying to arrange these blocks so that they form a correct sum.
- Newcastle: Octiamonds
- Manchester: inspired by today’s puzzles, @Andrew_Taylor has drawn this
- Manchester: dodecahedron
- Manchester: approximations of pi
- Manchester: The playing cards and vinegar puzzle
- Manchester: yet another game of Quarto
- Manchester: Lomino-based excitement
- Manchester: Serious game of Continuo
- Manchester: several types of non-transitive dice
- Manchester: mirrored cube assembly puzzle
- Manchester: general maths detritus
Behind closed doors: the Spanish intelligence service
When I was a student there was a door in the basement of the university library marked “This door must remained closed at all times”. I remember joking that perhaps no one could remember what was behind it, and of course they couldn’t check.
The BBC are reporting that GCHQ have received two Engima machines used in the Spanish civil war, in exchange for a German four rotor Naval Enigma machine recovered from Flensburg in May 1945, an Enigma rotor box and related documents.
The machines were apparently discovered “almost by chance, only a few years ago, in a secret room at the Spanish Ministry of Defence in Madrid.” The BBC quotes Felix Sanz, the director of Spain’s intelligence service, saying:
Nobody entered there because it was very secret, and one day somebody said ‘Well if it is so secret, perhaps there is something secret inside.’ They entered and saw a small office where all the encryption was produced during not only the civil war but in the years right afterwards.
It’s good to hear the Spanish intelligence service is taking secrecy so seriously, to almost Monty Python levels of silliness.
An interesting article, it also gives a hint at international co-operation. Mr Sanz is quoted saying:
In today’s world it is impossible to work alone. You need friends and allies. I knock at the door of the British intelligence – all three agencies – as many occasions as I need it and I always get a response. And I hope on the occasion where the British services knock at my door, when they leave my house they leave with a sense they have been helped also.
I find this last sentence interesting. It may be entirely coincidental, or a product of translation, but it doesn’t actually say that he helps the British intelligence services. This reminds me of a joke in the opening episode of the excellent Yes, Minister, in which the meeting of the Minister, Jim Hacker, and his civil servant Sir Humphrey, contains the following dialogue:
Bernard Woolley: “I believe you know each other.”
Sir Humphrey: “Yes, we did cross swords when the Minister gave me a grilling over the estimates in the Public Accounts Committee.”
Jim Hacker: “I wouldn’t say that.”
Sir Humphrey: “You came up with all of the questions I hoped nobody would ask.”
Jim Hacker: “Well, opposition is about asking awkward questions.”
Sir Humphrey: “And government is about not answering them.”
Jim Hacker: “Well, you answered all mine anyway.”
Sir Humphrey: “I’m glad you thought so, Minister.”
Carnival of Mathematics – The Next Generation
Mike Croucher has written a post about the next incarnation of the Carnival of Maths, which we are coordinating.
Reviving the Carnival of Mathematics
Those keeping score may have noticed there hasn’t been a new Carnival of Mathematics for a while. I’ve agreed to take a small part in running it from now on with Katie Steckles and Christian Perfect, as part of a secret new project we’re plotting. To get the ball rolling again, I’ve volunteered to host a new Carnival.
What is the Carnival of Mathematics? It’s a monthly (ish) mathematical blogging roundup. Here’s a description:
The Carnival of Mathematics accepts any mathematics-related blog posts: explanations of serious mathematics, puzzles, writing about mathematics education, mathematical anecdotes, refutations of bad mathematics, applications, reviews, etc. Sufficiently mathematized portions of other disciplines are also acceptable.
The previous Carnival of Mathematics was number 84, posted at Mathematics and Multimedia in December. So this is an announcement that the Carnival of Mathematics 85 will be hosted here on Travels in a Mathematical World in April. Please get your posts in by 2nd April. To submit articles, Katie has made a form which you should find embedded below or on the Carnival of Mathematics submission form.
You may recommend a post from your blog or a favourite you have read elsewhere. It’s helpful if you would put something in the comments box about the post and why you submitted it.
You can help by blogging, tweeting, etc. a link to this page or the submission form. Thank you!
Update (21/03/2012): Just to note that Mike Croucher, previous curator of the Carnival, has posted a blog post about the new arrangements: Carnival of Mathematics – The Next Generation.
Visualising the wrong data on the Guardian data blog
This visualisation shows for each council or unitary authority how many hours a week you’d need to work, earning minimum wage, in order to pay the median rent for a one-bed flat. The minimum wage is a national constant.
No justification is given for using the median rent. In a fair world, the median rent should be paid by someone on the median income. Assuming that people earning the minimum wage are the lowest earners1 and make up X% of the population, then an upper bound for rent paid by people earning minimum wage should be the Xth percentile, if housing is provided fairly2.
Continue reading “Visualising the wrong data on the Guardian data blog” on cp’s mathem-o-blog
MathsJam February 2012 Photos
Puzzlebomb – March 2012
Puzzlebomb is a monthly puzzle compendium. Issue 3 of Puzzlebomb, for March 2012, can be found here:
Puzzlebomb – Issue 3 – March 2012
The solutions to Issue 3 can be found here:
Puzzlebomb – Issue 3 – March 2012 – Solutions
Previous issues of Puzzlebomb, and their solutions, can be found here.















