00346nam a22001337a 450000500170000002000180001710000170003524500520005226000390010430000140014365000180015765000200017570000170019520260113155206.0  a9781771889667  aAmmar, Aymen  aSpectral theory of multivalued linear operators  aCanadabApple academic pressc2022  axviii+295  aPseudospectra  aLinear relation  aJeribi, Aref