[[Image:DIAGRAM.jpg|thumb|right|[[Sexual Difference|The diagram of sexual difference]]]]
In the [[seminars|seminar]] of [[chronology|1970-1]] [[Jacques Lacan]] tries to [[formalize]] his [[sexual difference|theory of sexual difference]] by means of [[mathemes|formulae]] derived from [[symbolic]] [[logic]].
The diagram is divided into two sides: on the left, [[formulae of sexuation|the male side]], and on the right, [[formulae of sexuation|the female side]].
The [[formulae of sexuation]] appear at the top of the diagram.