The critique as method in the return to Freud. In his project of a return to Freud, Lacan proposes a dialogue with other disciplines for the analysis of psychoanalytic concepts. This paper presents an analysis of the contribution of concepts from linguistics, logic and mathematics in the elaboration of the concept of unconscious subject, as appears in the matheme: a signifier represents a subject to another signifier. The term critique refers to the analysis of rationality necessary to reach knowledge. This work concludes that the formulation of the concept of the unconscious subject leads Lacan to the development of a signifiant's logic. This logic may be named as a psychoanalytical logical.
Psychoanalysis; critique; method; logic