%0 Journal Article %A Díaz Sánchez, Raquel %T A characterization of Gram matrices of polytopes %D 1999 %@ 0179-5376 %U https://hdl.handle.net/20.500.14352/57388 %X We give a characterization of the Gram matrices of spherical and finite-volume hyperbolic polytopes of a given combinatorial type. This is done in terms of the signs of certain minors of the Gram matrix. %~