On a conjecture of G. N. de Oliveira on determinants
Natália Bebiano, Jorma Kaarlo Merikoski, João da Providência · Linear and Multilinear Algebra · 1987
Let A and B be complex diagonal n × A matrices with A = diag (a 1, …an )B = diag (b 1, …bn ). De Oliveira's conjecture where Co means the convex hull and S n is the symmetric group of degree n, is shown to be true in the case n = 3.