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Formed by derivation from "[[mathematics]]" and by analogy with [[phoneme]] and [[Lévi-Strauss]]'s [[mytheme]],<ref>''Mytheme'' is a term coined by [[Claude Lévi-Strauss]] to denote the basic constituents of mythological systems.</ref> the term is an equivalent to "[[algebra|mathematical sign]]". It is not used in conventional [[mathematics]], but is part of [[Lacan]]'s [[algebra]].
=====Schema L=====
In 1955, [[Lacan]] introduced what could be called his first [[matheme]], the relatively simple "[[matheme|schema L]]", illustrating the [[imaginary|imaginary function]] of the [[ego]].
[[Matheme|Schema L]] identifies four points in the [[signifying chain]]:
# [[Image:Biga.gif]], the [[unconscious]] or the "[[discourse]] of the [[Other]]]", and then .
# [[Image:Smalls.gif]], the [[subject]], which in turn results from the relation between
# [[Image:Smalla.gif]], the [[ego]] and
# [[Image:Smalla'.gif]], the [[counterpart|other]].
