The doctoral thesis which Birkhoff submitted was entitled Asymptotic Properties of Certain Ordinary Differential Equations with Applications to Boundary Value and Expansion Problems and it led to the award of his Ph.D. in 1907.
Ang tesis ng doktor na Birkhoff na isinumite ay may karapatan Asymptotic Properties ng ilang Karaniwang kaugalian equation na may mga aplikasyon sa hangganan na Halaga at pagpapalawak Problema at ito na humantong sa award ng kanyang Ph.D. sa 1907.