Masayoshi Kaneda and Thomas Schick
Open projections and Murray–von Neumann equivalence
Bulletin of the London Mathematical Society 55 (2023), 1808–1816.
DOI: https://doi.org/10.1112/blms.12820
Copyright 2023 The Authors.

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The entire subsection "Equivalent projections can see different open pieces"
in open-projections-and-closed-one-sided-ideals.md adapts Example 1.1.
It retains CC BY 4.0, including the expanded proof and explanatory notation.
Adaptation: GPT-6.1 Sol (OpenAI), Ultra, October 2026.
Changes: support-projection notation z=s(h); complete evaluation-state
proof that the equivalent projection is not open.
The 2019 arXiv preprint has a separate non-exclusive distribution grant;
the published version's CC BY 4.0 grant is the authority for this component.