Did Mahmoud Ahmadinejad really win a landslide election on the 12th of June 2009? Many believe that he didn't, but only a full election re-run scrutinised by independent observers would bring absolute certainty. With this possibility thoroughly off the cards, as the Guardian Council has made clear, some analysts have had a long and hard look at the figures released by the very government
accused of doing the rigging, to see if they reveal evidence of fraud.
My name is R. Mansilla. I work at National Autonomous University of Mexico. After professor Mebane, we used Benford Law to test a fraud in the 2006 presidential election here in Mexico. The results could be found at:
Fancy crashing through the sound barrier in a rocket propelled car that goes all the way up to 1000mph? Well, we can't give you that experience, but we can get you as close as any maths magazine ever will. Last week we interviewed Andy Green, currently the fastest man on Earth (and Oxford maths graduate), who's now gearing up to break his own land speed record in his Bloodhound SSC — a pencil
shaped car powered by a Eurofighter aircraft engine. The car is currently being simulated on super computers, exploiting the full power of computational fluid dynamics and all sorts of other bits of engineering maths, and it's just about to move into the construction phase.
You will be able to read our interview and an article on the maths that makes Bloodhound possible in the September issue of Plus, but meanwhile go and visit the Bloodhound SSC website. It tells you all there is to know about this engineering adventure, the car, and the team behind it. There's a substantial education programme associated to the
project — you can sign up for engineering and maths based teaching resources, from instructions to build your own balloon powered car to experimenting with the speed of sound. You can also sign up for an email newsletter, or follow Bloodhound on Twitter.
Last week's BBC programme The price of life highlighted the plight of cancer sufferers awaiting a decision by NICE, the National Institute for Health and Clinical Excellence, on a new drug that could add years to their lives. If approved by NICE, the drug, called revlimid and used to treat a cancer called multiple myeloma, could be
prescribed freely on the NHS. If rejected, the prohibitive cost would spell the end of the line for many patients. In the light of the suffering facing myeloma patients and their families, the main criterion for NICE's decisions — cost-effectiveness — seems almost inhumane. But exactly what kind of mathematical considerations go into NICE's calculations?
In our second online poll to find out what Plus readers would most like to know about the Universe, you told us that you'd like to know if the constants of nature really are constant. We took the question to cosmologist John D. Barrow, Professor of Mathematical Sciences at the University of Cambridge, and here is his answer. Please feel free to discuss the answer by leaving a comment on this blog. We'll periodically check back with the experts to try and answer interesting further questions.
We took your question about the speed of light to John D Barrow and here is his answer:
"No, there can never be a proof that the speed of light is constant. Relativity theory requires the speed of light in vacuum to be constant and the same for all observers. All we can do is test whether that is true and hence whether the theory of relativity is a corrrect description of nature. There may be tiny quantum mechanical corrections to the theory which produce very small changes in
extreme environments (very small distance, high frequencies or strong gavitational fields)."
"An added subtlety is that in most of these possible worlds life cannot exist."
This leads to another question: what do you mean by 'life'? What makes life special? How can it be that there might be a world where rocks etc. can exist but 'life' (whatever definition you choose for that word) can't?
A constant is nothing but it is a derived numerical ratio between the two same fundamental quantities.The constant is said to be a point function,since it is constant at a point when it is made to travel at different atmosphere with different velocities,the value of constant may varie and moreover an example to say that the velocity of light is constant,when abody is made to move with a
velocity equal to light then the constant may vary relative to this object speed.so constant is an induvidual point function and independent from the different variables.