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Feb 13, 2016 at 14:06 comment added Alan Ok, thanks. I will dive in; seems like a solid foundation for me, theorywise.
Feb 13, 2016 at 14:05 comment added Alexandre Eremenko It deals with "theory", as you said. With perturbation theory for linear operators. Linear operators can be differential or not, differential operators can be ordinary or partial. It begins with a large chapter of perturbation of finite dimensional operators.
Feb 13, 2016 at 14:00 comment added Alan @AlexandreEremenko does it deal with pertubation theory in PDEs?
Feb 13, 2016 at 13:54 comment added Alexandre Eremenko Tosio Kato. Perturbation theory for linear operators.
Feb 13, 2016 at 4:40 history asked Alan CC BY-SA 3.0