Deduce from Broyden's theorem that there exist a strictly positive vector $x$ and a sign diagonal matrix $S$ such that $O x = S x$ and deduce that $u = x + S x$ is the positive vector of Tucker's theorem.
Deduce from Broyden's theorem that there exist a strictly positive vector $x$ and a sign diagonal matrix $S$ such that $O x = S x$ and deduce that $u = x + S x$ is the positive vector of Tucker's theorem.