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math.RA2011
Essential dimension of projective orthogonal and symplectic groups of small degree
Sanghoon Baek
In this paper, we study the essential dimension of classes of central simple algebras with involutions of index less or equal to 4. Using structural theorems for simple algebras wi…
math.RA2011
Basic polynomial invariants, fundamental representations and the Chern class map
Sanghoon Baek, Erhard Neher, Kirill Zainoulline
Consider a crystallographic root system together with its Weyl group acting on the weight lattice . Let and be the -invariant subrings of the integral…