Online textbook written by Gerald Teschl, a Faculty of Mathematics member at the University of Vienna. This online mathematics and physics textbook for graduate students offers an introduction to mathematical methods in quantum mechanics with applications to Schrödinger operators.

An abstract, contained within the text, explains it as providing “a self-contained introduction to mathematical methods in quantum mechanics (spectral theory) with applications to Schrödinger operators. The first part covers mathematical foundations of quantum mechanics from self-adjointness, the spectral theorem, quantum dynamics (including Stone’s and the RAGE theorem) to perturbation theory for self-adjoint operators.”

The second section of *Mechanical Methods in Quantum Mechanics* begins “with a detailed study of the free Schrödinger operator respectively position, momentum and angular momentum operators” It concludes with “a look at scattering theory and proves asymptotic completeness in the short range case.”

## Table of Contents for *Mathematical Methods in Quantum Mechanics*

- Part 0: Preliminaries

- Chapter 0. A first look at Banach and Hilbert spaces
- 0.1. Warm up: Metric and topological spaces
- 0.2. The Banach space of continuous functions
- 0.3. The geometry of Hilbert spaces
- 0.4. Completeness
- 0.5. Bounded operators
- 0.6. Lebesgue Lpspaces
- 0.7. Appendix: The uniform boundedness principle

- Part 1: Mathematical Foundations of Quantum Mechanics

- Chapter 1. Hilbert spaces
- 1.1. Hilbert spaces
- 1.2. Orthonormal base
- 1.3. The projection theorem and the Riesz lemma
- 1.4. Orthogonal sums and tensor products
- 1.5. The C* algebra of bounded linear operators
- 1.6. Weak and strong convergence
- 1.7. Appendix: The Stone-Weierstraß theorem
- Chapter 2. Self-adjointness and spectrum
- 2.1. Some quantum mechanics
- 2.2. Self-adjoint operators
- 2.3. Quadratic forms and the Friedrichs extension
- 2.4. Resolvents and spectra
- 2.5. Orthogonal sums of operators
- 2.6. Self-adjoint extensions
- 2.7. Appendix: Absolutely continuous functions
- Chapter 3. The spectral theorem
- 3.1. The spectral theorem
- 3.2. More on Borel measures
- 3.3. Spectral types
- 3.4. Appendix: Herglotz-Nevanlinna functions
- Chapter 4. Applications of the spectral theorem
- 4.1. Integral formulas
- 4.2. Commuting operators
- 4.3. Polar decomposition
- 4.4. The min-max theorem
- 4.5. Estimating eigenspaces
- 4.6. Tensor products of operators
- Chapter 5. Quantum dynamics
- 5.1. The time evolution and Stone’s theorem
- 5.2. The RAGE theorem
- 5.3. The Trotter product formula
- Chapter 6. Perturbation theory for self-adjoint operators
- 6.1. Relatively bounded operators and the Kato-Rellich theorem
- 6.2. More on compact operators
- 6.3. Hilbert-Schmidt and trace class operators
- 6.4. Relatively compact operators and Weyl’s theorem
- 6.5. Relatively form bounded operators and the KLMN theorem
- 6.6. Strong and norm resolvent convergence

- Part 2: Schrödinger Operators

- Chapter 7. The free Schrödinger operator
- 7.1. The Fourier transform
- 7.2. Sobolev spaces
- 7.3. The free Schrödinger operator
- 7.4. The time evolution in the free case
- 7.5. The resolvent and Green’s function
- Chapter 8. Algebraic methods
- 8.1. Position and momentum
- 8.2. Angular momentum
- 8.3. The harmonic oscillator
- 8.4. Abstract commutation
- Chapter 9. One-dimensional Schrödinger operators
- 9.1. Sturm-Liouville operators
- 9.2. Weyl’s limit circle, limit point alternative
- 9.3. Spectral transformations I
- 9.4. Inverse spectral theory
- 9.5. Absolutely continuous spectrum
- 9.6. Spectral transformations II
- 9.7. The spectra of one-dimensional Schrödinger operators
- Chapter 10. One-particle Schrödinger operators
- 10.1. Self-adjointness and spectrum
- 10.2. The hydrogen atom
- 10.3. Angular momentum
- 10.4. The eigenvalues of the hydrogen atom
- 10.5. Nondegeneracy of the ground state
- Chapter 11. Atomic Schrödinger operators
- 11.1. Self-adjointness
- 11.2. The HVZ theorem
- Chapter 12. Scattering theory
- 12.1. Abstract theory
- 12.2. Incoming and outgoing states
- 12.3. Schrödinger operators with short range potentials

- Part 3: Appendix

- Appendix A. Almost everything about Lebesgue integration
- A.1. Borel measures in a nut shell
- A.2. Extending a premeasure to a measure
- A.3. Measurable functions
- A.4. How wild are measurable objects
- A.5. Integration – Sum me up, Henri
- A.6. Product measures
- A.7. Transformation of measures and integrals
- A.8. Vague convergence of measures
- A.9. Decomposition of measures
- A.10. Derivatives of measures

- Bibliographical notes
- Bibliography
- Glossary of notation
- Index

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Mathematical Methods in Quantum Mechanics