The Difference Between the Democritean and Epicurean Philosophy of Nature

The Difference Between the Democritean and Epicurean Philosophy of Nature (German: Differenz der demokritischen und epikureischen Naturphilosophie) is a book written by the German philosopher Karl Marx as his university thesis. Completed in 1841, it was on the basis of this work that he earned his Ph.D. The thesis is a comparative study on atomism of Democritus and Epicurus on contingency.

His thesis advisor was his fellow Young Hegelian and personal friend, Bruno Bauer.