In mathematics, the determinantal conjecture of Marcus (1972) and de Oliveira (1982) asks whether the determinant of a sum A + B of two n by n normal complex matrices A and B lies in the convex hull of the n! points Πi (λ(A)i + λ(B)σ(i)), where the numbers λ(A)i and λ(B)i are the eigenvalues of A and B, and σ is an element of the symmetric group Sn.
References
- de Oliveira, G.N. (1982), "Research problem: Normal matrices", Linear and Multilinear Algebra, 12: 153–154, doi:10.1080/03081087.1982.11882087
- Marcus, Marvin (1972), "Derivations, Plücker relations, and the numerical range", Indiana University Mathematics Journal, 22 (12): 1137–1149, doi:10.1512/iumj.1973.22.22094, ISSN 0022-2518, MR 0314862
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