Working in Operator Theory (Preliminary)
Getting started
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Take as much linear algebra as possibe
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Horn and Garcia’s A Second Course in Linear Algebra
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Sergei Treil’s Linear Algebra Done Wrong
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Take as much complex analysis as possible
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Donald Sarason’s Complex Function Theory is a short and self-contained one semester introduction
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A First Course in Complex Analysis by Beck, Marchesi, Pixton, and Sabalka
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Read Sheldon Axler’s Linear Algebra Done Right if you didn’t use it for your second linear algebra course
- http://linear.axler.net A complete video lecture series by Sheldon Axler and other resources
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Follow up with Nicholas Young’s Introduction to Hilbert Space
- Hilbert Space: a sequel to linear algebra online text adapted from and inspired by Introduction to Hilbert Space by Ryan Tully-Doyle
Graduate school
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Ideally, you’ll take a year each of real, complex, and functional analysis
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Consider matrix theory, harmonic analysis, PDE, probability, and abstract algebra
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Learn some mathematical programming - many hypotheses in functional operator theory can be tested on examples