technical treatment of the mathematics involved in the topic, see Measurement in quantum mechanics. Absolute time and space Constructor theory Einstein's thought experiments EPR paradox Gleason's theorem Observer effect (physics) Observer (quantum physics) Philosophy of physics Quantum cognition Quantum pseudo-telepathy Quantum Zeno effect Wigner's friend References and notes Further reading R. Buniy, S. Hsu and A. Zee On the origin of probability in quantum mechanics (2006) de:Quantenmechanische Messung#Das Messproblem