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I am a 3rd year undergraduate student. What are the things that would be good to know if I apply for PhD? I want to do a PhD in non-commuative topology.

I am fascinated by this non-commutative aspect. I have no knowledge of $K$-theory or $C^{\ast}$-algebras yet. I have read Hatcher upto homology. I am reading differential geometry fromm S. S. Chern and in analysis I am studying from Rudin's Real and Complex Analysis as well as Functional Analysis.

How much should I read in order to understand and from which books in order to understand non-commutative geometry fully?

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    You may want to try reading something like Kalkhali's Very Basic Noncommutative Geometry http://arxiv.org/abs/math/0408416. Though in my (very limited) experience it's more effective to approach research by trying to tackle a specific problem and learning the tools you need as you go along. In lieu of that, read as much operator algebra and geometry as you can.2012-07-05
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    Depending on what flavor non-commutative topology you want to learn a lot of homological algebra. You might want to start glancing at Weibel's An Introduction to Homological Algebra. It is my understanding that a lot of motivation comes from derived categories of varieties.2012-07-05

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