<human>:  What is the equation Paul Dirac is most famous for?
<bot>: The Dirac equation is a partial differential equation that describes the behavior of electrons in atoms. It is named after Paul Dirac, who was a British physicist who won the Nobel Prize in 1933 for his work on quantum mechanics. The Dirac equation is a fundamental equation of quantum mechanics, and it is used to describe the behavior of electrons in atoms.