elliptope

== English == === Etymology === coined in: M. Laurent and S. Poljak, On a positive semidefinite relaxation of the cut polytope, Linear Algebra Appl., 223/224, (1995), 439-461 === Noun === elliptope (plural elliptopes) (mathematics) The set of all real, square symmetric matrices whose diagonal entries are all equal to one and whose eigenvalues are all non-negative.