We prove that it is #P-hard to compute the mixed discriminant of rank 2 positive semidefinite matrices. We present poly-time algorithms to approximate the "beast". We also prove NP-hardness of two problems related to mixed discriminants of rank 2 positive semidefinite matrices. One of them, the so called Full Rank Avoidance problem, had been conjectured to be NP-Complete in [23] and in [25]. We also present a deterministic poly-time algorithm computing the mixed discriminant D(A1,., AN) provided that the linear (matrix) subspace generated by {A1, .., AN} is small and discuss randomized algorithms approximating mixed discriminants within absolute error. © Springer-Verlag Berlin Heidelberg 2005.
CITATION STYLE
Gurvits, L. (2005). On the complexity of mixed discriminants and related problems. In Lecture Notes in Computer Science (Vol. 3618, pp. 447–458). Springer Verlag. https://doi.org/10.1007/11549345_39
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