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The [[Oedipus complex]] is, for [[Lacan]], the paradigmatic triangular [[structure]], which contrasts with all [[dual relation]]s (though see the final paragraph below). The key function in the [[Oedipus complex]] is thus that of the [[father]], the third term which transforms the [[dual relation]] between [[mother]] and [[child]] into a [[triad]]ic [[structure]]. The [[Oedipus complex]] is thus nothing less than the passage from the [[imaginary]] [[order]] to the [[symbolic order]], "the conquest of the symbolic relation as such."<ref>{{S3}} p.199</ref> The fact that the passage to the [[symbolic]] passes via a complex sexual [[dialectic]] means that the [[subject]] cannot have access to the [[symbolic order]] without confronting the problem of [[sexual difference]].

In ''[[Seminar|The Seminar, Book V]]'', [[Lacan]] analyzes this passage from the [[imaginary]] to the [[symbolic]] by [[identification|identifying]] three "times" of the [[Oedipus complex]], the sequence being one of logical rather than chronological priority.<ref>{{L}} 1957-8: [[seminar]] of 22 January 1958</ref>

<!-- In the previous [[seminar]] of 1956-7, [[Lacan]] calls this the [[preoedipal]] [[triangle]]. However, whether this [[triangle]] is regarded as [[preoedipal]] or as a moment in the [[Oedipus complex]] itself, the main point is the same: namely, that prior to the invention of the [[father]] there is never a purely [[dual relation]] between the [[mother]] and the [[child]] but always a third term, the [[phallus]], an [[imaginary]] [[object]] which the [[mother]] [[desire]]s beyond the [[child]] himself (S4, 240-1). [[Lacan]] hints that the presence of the [[imaginary]] [[phallus]] as a third term in the [[imaginary]] [[triangle]] indicates that the [[symbolic]] [[father]] is already functioning at this time.<ref>{{L}} 1957-8: [[seminar]] of 22 January 1958</ref> -->