Rump, Siegfried M.Siegfried M.Rump2019-04-162019-04-162019-02-15Linear Algebra and Its Applications (563): 215-219 (2019-02-15)http://hdl.handle.net/11420/2326Each connected component of the Gershgorin circles of a matrix contains exactly as many eigenvalues as circles are involved. Thus the power set product of all circles is an inclusion of the determinant if all circles are disjoint. We prove that statement to be true for real matrices, even if their circles overlap.en0024-37952019215219Technology::600: TechnologyJournal Article10.1016/j.laa.2018.10.020Journal Article