I am updating my knowledge by following some courses on coursera.org, that is: https://www.coursera.org/course/compneuro (computational neuroscience) and https://www.coursera.org/course/eqp (exploring quantum physics). I found both require that kind of math called statistic, or something like that, and summing vector of values, multidimensional calculus ... very interesting and mind opening.
First of all, I have to pay some money to take it, so I tried to get information about this exam.
I would talk about a pattern whose name I fail to know before, giving it the name of multi-singleton.
I read about it in PHP 5 certification study guide from php|architect's series. This is the example given: