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Notes on De Jong's period=index theorem for central simple algebras over fields of transcendence degree two
Michel Van den Bergh
These are notes on de Jong's proof of the period=index theorem over fields of transcendence degree two. They are actually about the simplified proof sketched by de Jong in the last…
math.RT2008
A degree inequality for Lie algebras with a regular Poisson semi-center
A. I. Ooms, M. Van den Bergh
For Lie algebras whose Poisson semi-center is a polynomial ring we give a bound for the sum of the degrees of the generating semi-invariants. This bound was previously known in man…