Alec Kriebel. A torus-collar proof of the real-spectrum compact-support
classification for Nijenhuis operators. Version 1.0, 15 October 2026.
Unrefereed preprint and supporting verification kit. ORCID 0009-0001-9320-500X.
CC BY 4.0. No DOI has been assigned at preparation. Full-result and method
priority remain unestablished; extensive AI assistance is disclosed.
