Klaas Landsman
Foundations of Quantum Theory: From Classical Concepts to Operator Algebras
Springer, 2017; DOI 10.1007/978-3-319-51777-3
Copyright The Author(s) 2017.

The book is licensed under Creative Commons Attribution 4.0 International.
Licence and terms: https://creativecommons.org/licenses/by/4.0/
Source: https://doi.org/10.1007/978-3-319-51777-3
Grant locator: book copyright page (PDF page 5).

The course subsection "States and mixtures on a matrix block" in
extreme-points-and-matrix-blocks.md adapts Theorem 2.7, Lemma 2.11,
Proposition 2.14 and the nonunique-mixture example, printed pages 44–48.
This entire subsection, including proofs and example, retains CC BY 4.0.
AI adaptation: GPT-6.1 Sol (OpenAI), Ultra, October 2026.
Changes: matrix notation; expanded positivity and support arguments;
placement after the matrix-block construction. The finite-dimensional
hypothesis is retained. No source-book images are reproduced.
The original expression elsewhere in the lesson retains CC0 1.0.