This paper seeks to build a presentation of Lacan's use of topology, questioning its reasoning, function and relevance to psychoanalysis. To this purpose, it explores the notion of model, an important kind of abstraction in the structuralism context, as well as the opposition between homology and analogy, from which a crucial contribution from Lacan to the psychoanalytic theory will be elucidated, meaning the proposal of a new research method - the structural topology, whose ontological and methodological aspects will be discussed.
topology; structure; Lacan; research