https://ujcontent.uj.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Spin Hamilton operators, symmetry breaking, energy level crossing and entanglement https://ujcontent.uj.ac.za/vital/access/manager/Repository/uj:5975 Thu 22 Aug 2019 15:39:48 SAST ]]> Exceptional points, nonnormal matrices, hierarchy of spin matrices and an eigenvalue problem https://ujcontent.uj.ac.za/vital/access/manager/Repository/uj:5979 Thu 22 Aug 2019 07:38:47 SAST ]]>