▁an ▁A I HS . ▁ ▁In ▁the ▁complex ▁setting ▁it ▁has ▁already ▁been ▁solved ; ▁that ▁is , ▁if ▁ ▁is ▁a ▁complex ▁infinite - dimensional ▁Ban ach ▁space ▁and ▁ ▁then ▁ ▁adm its ▁an ▁A I HS ▁of ▁defect ▁at ▁most ▁ 1 . ▁ ▁It ▁is ▁not ▁currently ▁known ▁whether ▁the ▁same ▁holds ▁if ▁ ▁is ▁a ▁real ▁Ban ach ▁space . ▁ ▁However , ▁some ▁partial ▁results ▁have ▁been ▁established . ▁ ▁For ▁instance , ▁any ▁self ad joint ▁operator ▁on ▁an ▁infinite - dimensional ▁real ▁Hil bert ▁space ▁adm its ▁an ▁A I HS , ▁as ▁does ▁any ▁strictly ▁singular ▁( or ▁compact ) ▁operator ▁acting ▁on ▁a ▁real ▁infinite - dimensional ▁ref lex ive ▁space . ▁ ▁See ▁also ▁ ▁In variant ▁manifold ▁ ▁Bibli ography ▁▁▁▁▁▁▁▁▁▁▁▁ ▁Category : Linear ▁algebra ▁Category : Operator ▁theory ▁Category : Re presentation ▁theory <0x0A> </s> ▁Z yg ogram ma ▁dis rupt a ▁is ▁a ▁species ▁of ▁be et le ▁belonging ▁to ▁the ▁family ▁Ch rys om el idae . ▁ ▁Description ▁Z . ▁dis rupt a ▁is ▁a ▁small ▁leaf ▁be et le ▁with ▁a ▁brown ▁pron ot um ▁and ▁yellow ▁el y tra ▁marked ▁with ▁el ong ated ▁brown ▁stri pes . ▁ ▁Distribution ▁and ▁Hab itat ▁Z . ▁dis rupt a ▁can ▁be ▁found ▁in ▁North ▁America , ▁and ▁was ▁introduced ▁to ▁Russia ▁in ▁the ▁ 1 9 8 0 s . ▁ ▁Ad ult ▁be et les ▁are ▁associated ▁with ▁R ag we ed ▁( family