## Lecture 5: Price equation

Here is the text for Lecture 5, which is devoted to a very unusual mathematical model of evolution: the Price equation.

Lecture 5

It is extremely interesting how a mathematical tautology, vis.

$\bar{w}\Delta \bar{z}=\mbox{Cov}(w,\,z)+E(w\Delta z),$

can be considered a fundamental principle in biology.