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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>
