Lluis Eriksson (2026). Temporal adjoints and injectivity lengths in stationary quantum processes. AIRR.SCIENCE, ARR-2026-5BWNCWFTY79W79RF, v2. https://airr.science/notes/ARR-2026-5BWNCWFTY79W79RF/versions/v2/ Technical note; ARR-2026-5BWNCWFTY79W79RF v2. Not peer reviewed by AIRR. Working paper; not admitted to the AIRR accepted collection.