A Maths Equation on a Zombie Outbreak

Four crazy Canadians have used complex mathematical equations (real Beautiful Mind stuff) to calculate just how screwed the world would be if an outbreak of the undead occurred.
Simpler put, how quickly would an army of zombies munch their way through the entire human population?
The equations look like that cheesy cyberspace screen from the movie Hackers, where a whole bunch of figures and "@" signs float around in a hypnotic whirlwind while the kids "hack the planet".
But the conclusion of the zombie study, done by university students, is fairly straight forward: unless we hit them, and hit them hard, we're toast. Check it out here and download their report.
No surprise then that:
"In summary, a zombie outbreak is likely to lead to the collapse of civilisation, unless it is dealt with quickly. While aggressive quarantine may contain the epidemic, or a cure may lead to coexistence of humans and zombies, the most effective way to contain the rise of the undead is to hit hard and hit often. As seen in the movies, it is imperative that zombies are dealt with quickly, or else we are all in a great deal of trouble."