 Popularly known as "Anti-Dühring", this book is a detailed critique of the philosophical positions of Eugen Dühring, a German philosopher and critic of Marxism.In the course of replying to Dühring, Engels reviews recent advances in science and mathematics seeking to demonstrate the way in which the concepts of dialectics apply to natural phenomena.Many of these ideas were later developed in the unfinished work, "Dialectics of Nature".