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Bernd Sturmfels

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Spectrahedra and their ShadowsSemidefinite Optimization, Approximation and Applications 20142014-09-24
Spectrahedra in three dimensions behave concretely: cubic examples come only in two combinatorial types — samosa vs lemon — with either four or two real nodes…
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Tutorial 2: Algorithmic Invariant TheoryGeometric Complexity Theory 20142014-09-15
Defines when a group is reductive by the existence of a Reynolds operator and proves Hilbert's 1890 finite-generation for reductive matrix groups; gives the…
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