Bibliography
- Evans, L.C., Partial Differential Equations.
- Folland, G.B., Real Analysis: Modern Techniques and Their Applications.
- Gerald B. Folland, A Course in Abstract Harmonic Analysis.
- Masamichi Takesaki, Theory of Operator Algebras I.
- Nicolas Bourbaki, General Topology: Chapters 1--4.
- nLab, Grothendieck Universe.