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The first position (with which each [[discourse]] starts) is called the [[discourse|agent]].
The four position is called the [[discourse|truth]].
The ''four'' [[symbol]]s correspond to ''four'' different [[discourse|positions]] in each [[matheme|algorithm]] of the [[discourse|four discourses]].
Each [[matheme|algorithm]] of the [[discourse|four discourses]] has ''four'' different [[discourse|positions]] with which the ''four'' [[symbol]]s correspond.
[[Image:Lacan-structurefourdiscourses.jpg|thumb|250px|right|The structure of the four discourses]]
The [[discourse|position]] of the ''four'' [[symbol]]s in each [[matheme|algorithm]] is what distinguishes the [[discourse|four discourses]] from one another.
The [[discourse|four discourses]] are distinguished from one another by the [[discourse|positions]] of these ''four'' [[symbol]]s in each [[matheme|algorithm]].
Each of the [[discourse|four discourses]] is defined by the [[discourse|position]] of the ''four'' [[symbol]]s in its [[matheme|algorithm]].
The names of the ''four'' [[discourse|positions]] are shown to the right.<ref>{{S20}} p. 21</ref>
The [[symbol]]s always remain in the same order, so each [[discourse]] is simply the result of rotating the [[symbol]]s a quarter turn.
The top-left position ("[[discourse|the agent]]") is the dominant position which defines the [[discourse]].
In addition to the four [[symbol]]s, each [[matheme|algorithm]] also contains an arrow going from the [[discourse|agent]] to the [[discourse|other]].
The [[four discourses]] are shown in the figure to the right.
[[Image:Lacan-fourdiscourses.jpg|thumb|right|The four discourses]]
===Arrows===
In 1971, [[Lacan]] proposes that the position of the [[discourse|agent]] is also the position of the [[semblance]].
In 1972, [[Lacan]] inscribes two arrows in the [[matheme|formula]]s instead of one; one arrow (which [[Lacan]] labels "impossibility") goes from the [[discourse|agent]] to the [[discourse|other]], and the other arrow (which is labelled "powerlessness") goes from [[discourse|production]] to [[discourse|truth]].<ref>{{S20}} p.21</ref>
For further information on the four discourses, see Bracher et al., 1994.</ref>
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