These notes present very recent results on compact K hler-Einstein
manifolds of positive scalar curvature. A central role is played
here by a Lie algebra character of the complex Lie algebra
consisting of all holomorphic vector fields, which can be
intrinsically defined on any compact complex manifold and becomes
an obstruction to the existence of a K hler-Einstein metric. Recent
results concerning this character are collected here, dealing with
its origin, generalizations, sufficiency for the existence of a K
hler-Einstein metric and lifting to a group character. Other
related topics such as extremal K hler metrics studied by Calabi
and others and the existence results of Tian and Yau are also
reviewed. As the rudiments of K hlerian geometry and Chern-Simons
theory are presented in full detail, these notes are accessible to
graduate students as well as to specialists of the subject.
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