英和和英

名詞

elliptope (複数形 elliptopes)

1. (mathematics) The set of all real, square symmetric matrices whose diagonal entries are all equal to one and whose eigenvalues are all non-negative.
   • 2016, Anupam Prakash, Jamie Sikora, Antonios Varvitsiotis, Zhaohui Wei, “Completely positive semidefinite rank”, in arXiv‎^[1]:

     In particular, we use a known lower bound on the size of matrix representations of extremal quantum correlations which we apply to high-rank extreme points of the ${\displaystyle n}$-dimensional elliptope. Lastly, we study cpsd-graphs, i.e., graphs ${\displaystyle G}$ with the property that every doubly nonnegative matrix whose support is given by ${\displaystyle G}$ is cpsd.