Plus Blog
July 17, 2008
Friday, July 18, 2008
Who is your favourite fictional mathematician?We all have favourite movie characters, but who is your favourite fictional mathematician? It is quite difficult to compile a list of fictional mathematicians. Scientists are often portrayed in films — usually as mad — but there are very few who are specialised mathematicians. Here at Plus, we have come up with a list that we think covers most wellknown fictional mathematicians, although it is debatable whether some are even mathematicians at all! We are asking for your opinion — who is your favourite? Have we missed yours off the list? Please leave a comment and let us know. We will write a biography of the character who wins the poll. posted by westius @ 12:06 PM 27 Comments:

July 16, 2008
Thursday, July 17, 2008
Bicycles in London modelling contest run and wonMP Emily Thornberry, eBourbaki founder Eliana Hechter, and contest winners Peter Eccles, Tom Hudson, and Ryan Lothian.
eBourbaki has announced the winners of its 2008 Bicycles in London mathematical modelling competition. The contest took place in early May, and students were asked to model a network of lowcost rental bicycles for the City of London. Students were able to explain mathematically why some schemes in Europe have succeeded while others have failed. For more information on the contest, see our story on the Plus blog The winning team was presented with a check for £1000 by Emily Thornberry MP, head of the All Party Parliamentary Group on Cycling. The winning team included:
The winning team created two mathematical models. The first described commuter flow based on publicly available data from Transport for London. They recommend that 12 large bicycle stations be placed near rail stations in Central London together with a network of 250 smaller stations distributed throughout the West End, the City of London, and the area in between. The second model focused on the estimated use of a network of 50 stations in the proposed configuration to determine the number of bicycles appropriate for these stations. Ultimately, the team proposed an average of twenty bicycles at a small station. eBourbaki director Eliana Hechter said, "The winning team created a mathematical model that could serve to help the City of London construct a network of rental bicycles that serves commuters most efficiently. Mathematical modelling is a way of 'testing the system' to be confident that the system, once instituted, will actually work effectively. We hope the City will work with the winners and consider using their programs in the network design." eBourbaki organizes mathematics modelling contests for students of mathematics, computer science, and engineering around the world to provide solutions to optimization problems, addressing some of today’s greatest public goods issues. The policy implications of this contest are great and the results have been forwarded to Transport for London. The Bicycles in London contest followed the successful Shade in Phoenix contest in conjunction with the City Planning Department of the City of Phoenix, Arizona. eBourbaki’s next contest will involve predicting the results of the next U.S. presidential election this October. We'd all like to know that result. posted by westius @ 9:29 AM 0 Comments: 
July 15, 2008
Wednesday, July 16, 2008
Mathematicians working on one of the bedrocks of mathematics, the Fundamental Theorem of Algebra (FTA), have recently found collaborative allies in the unlikely field of astrophysics. Labels: Latest news posted by westius @ 10:18 AM 0 Comments: 
July 2, 2008
Thursday, July 03, 2008
Global war death toll should be tripledThe death toll from wars around the globe in the second half of the twentieth century should be increased by a factor of three, according to a recent mathematical study by Ziad Obermeyer and colleagues at the Institute for Health Metrics and Evaluation in Seattle, Washington. Estimating a war death toll is usually done by a mixture of eyewitness reports and media coverage. This involves extrapolating large numbers from sketchy data — read more about how this is done in the Plus article Body count. Uppsala University in Sweden, and the Peace Research Institute in Norway, both keep death toll records estimated from media coverage, but Obermeyer's study suggests that the recorded death toll for 20th century wars could have been up to three times higher than they record. The researchers looked at the death toll estimates gathered by the World Health Organization (WHO) — these numbers are extrapolated from telephone interviews with individuals with family members who may have died. This method is considered to be more accurate than gathering information from media reports. In most cases, the WHO surveys recorded much higher numbers of dead than the Norwegian and Swedish databases. For example, the WHO figures suggest that more than twice the number of people died in Vietnam than previously thought — currently recorded at two million. On average, across 12 countries, the WHO figures are three times bigger. If true, then the average annual death toll for wars between 1985 and 1994 was 378,000. During the 50 years covered by the study, Obermeyer suggests that there were 269,000 deaths in Bangladesh and 141,000 in Zimbabwe — nearly five times more than previously thought — and conflicts in Sri Lanka, Bosnia, Georgia and Laos are also estimated to be more costly than previously thought. However, in other countries, such as Burma, Ethiopia, Guatemala, Namibia and The Philippines, the death tolls dropped. The study also found that a controversial report in 2006, which estimated the death toll after the invasion of Iraq at 655,000, may have been an overestimate. You can read more about this study in the Plus article Body count. Obermeyer revises this number down to 184,000. One downside of the study is that it only counts conflict fatalities and not deaths that have arisen from infectious diseases, which often afflict poor countries after war. posted by westius @ 2:54 PM 0 Comments: 
July 2, 2008
Thursday, July 03, 2008
No matter how many friends you have on Facebook and MySpace, you won't have more reallife friends than the average person. Using mathematics to model online social networks is an evolving field, with techniques that have been used to model human interaction, such as network modelling, moving into the online world. Users of online social networks tend to build up long lists of "friends" with whom they only occasionally interact, if at all. Given that we can maintain more weak relationships online than we can in reallife, it is an interesting question to ask whether or not online social networks create as many close friendships as in real life. According to Will Reader of Sheffield Hallam University, the answer is no, and in this there is an interesting scientific and social point to be found. Labels: Latest news posted by westius @ 1:21 PM 0 Comments: 
June 30, 2008
Tuesday, July 01, 2008
If we are to believe the latest signs from outer space, the local aliens are keen mathematicians. A new crop circle appeared on the 1st of June this year in a barley field near Barbury Castle in Wiltshire, England, measuring 150 feet in diameter and correctly representing the first 10 digits of the irrational constant pi. Labels: Latest news posted by westius @ 11:12 AM 0 Comments: 