It's not high math, it's elementary math...
http://en.wikipedia.org/wiki/Drake_equation
It's simply a helpful spelling out of all the variables that might affect the emergence of intelligent life in the universe. You know, you start with how probable it is that a star is born, then if that happens you wonder how probable it is that the star has planets, then if
that happens you ask how probable it is that the planets are earthlike, and so on. Each probability is denoted by a letter, and you get the probability of intelligent life emerging by multiplying all these other probabilities.
Timo Saloniemi