Abstract
It is proved in this paper that for a given simply connected Lie group G with Lie algebra g \mathfrak {g} , every left-invariant closed 2-form induces a symplectic homogeneous space. This fact generalizes the results in [7] and [12] that if H 1 ( g ) = H 2 ( g ) = 0 {H^1}(\mathfrak {g}) = {H^2}(\mathfrak {g}) = 0 , then the most general symplectic homogeneous space covers an orbit in the dual of the Lie algebra g \mathfrak {g} . A one-to-one correspondence can be established between the orbit space of equivalent classes of 2-cocycles of a given Lie algebra and the set of equivalent classes of simply connected symplectic homogeneous spaces of the Lie group. Lie groups with left-invariant symplectic structure cannot be semisimple; hence such groups of dimension four have to be solvable, and connected unimodular groups with left-invariant symplectic structure are solvable [4].
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