Geodesic
Lie Quasi-States
Journal of Lie theory, Tome 19 (2009) no. 3, pp. 613-637.

Voir la notice de l'article provenant de la source Heldermann Verlag

Lie quasi-states on a real Lie algebra are functionals which are linear on any abelian subalgebra. We show that on the symplectic Lie algebra of rank at least 3 there is only one continuous non-linear Lie quasi-state (up to a scalar factor, modulo linear functionals). It is related to the asymptotic Maslov index of paths of symplectic matrices.
Classification : 53D12, 17B99, 15A27, 15B99
Mots-clés : Quasi-state, Lie algebra, Maslov index, Gleason theorem 
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     author = {M. Entov and L. Polterovich },
     title = {Lie {Quasi-States}},
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     year = {2009},
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M. Entov; L. Polterovich . Lie Quasi-States. Journal of Lie theory, Tome 19 (2009) no. 3, pp. 613-637. http://geodesic.mathdoc.fr/item/JLT_2009_19_3_JLT_2009_19_3_a9/