00820nam0-22002771i-450-990001257340403321000125734FED01000125734(Aleph)000125734FED01000125734--------d--------km-y0itay50------baeng<<A >>Short Introduction to Perturbation Theory for Linear Operatorsby >KatoNew York [etc.]Springer-Verlag198Teoria della perturbazioneTeoria degli operatoriKato,Tosio40573ITUNINARICAUNIMARCBK9900012573404033216-M-1120971MA1MA147A5547-02Short introduction to perturbation theory for linear operators34040UNINA