ABSTRACT
The philosophical thought of the nineteenth century, through Nietzsche and Schopenhauer, among others, presented a concept of the unconscious marked by romanticism, a type of sub-conscious. This chapter accompanies the discussions of the Psychoanalytic Epistemology Study Group of the Porto Alegre Psychoanalytic Society about complexity and psychoanalysis. The principal objective is to present an approach to the unconscious from the perspective of complexity and of the chaos theory. It starts with the presentation of some notions of these concepts in order to relate them later to the comprehension of the object of this study called the unconscious, relating it principally with the ideas of Matte Blanco. Matte Blanco lingers on the study of infinite sets, highlighting that they correspond to the unique situation where the part is equal to the whole, where a sub-group is equal to the whole group, which is what we find in the symmetrical logic of the unconscious.
