Abstract

Quantum mechanics lacks a formal account of the observer, leaving the measurement postulate structurally incomplete. I introduce a minimal operator chain: J, A, C, L, R, that formalizes recognition, articulation, collapse, and observation. Inserting these operators into the standard measurement rule yields a complete and stable measurement structure without altering quantum predictions. A spin‑measurement example and a reconstruction of Wigner’s friend demonstrate that paradoxes dissolve when collapse is explicitly observer‑indexed. Authored by Eloy Escagedo Gutierrez as part of The Universal Principle of Collapse (UPC) Research Project.