Lluis Eriksson (2026). The Action—Memory Diamond: Exact Resource Regions for Passive Matrix Networks Autor. AIRR.SCIENCE, ARR-2026-1CYF5ZA33T9A2AD6, v1. https://airr.science/papers/ARR-2026-1CYF5ZA33T9A2AD6/versions/v1/ Archived manuscript; ARR-2026-1CYF5ZA33T9A2AD6 v1. Not peer reviewed by AIRR. Historical import; not assessed by AIRR.