Related Experiment Video
Updated: Jul 9, 2025

A Psychophysics Paradigm for the Collection and Analysis of Similarity Judgments
Published on: March 1, 2022
On the consistency of relative facts
Eric G Cavalcanti1, Andrea Di Biagio2,3, Carlo Rovelli4,5,6
1Centre for Quantum Dynamics, Griffith University, Gold Coast, QLD 4222 Yugambeh Country Australia.
Abstract:
Lawrence et al. have presented an argument purporting to show that "relative facts do not exist" and, consequently, "Relational Quantum Mechanics is incompatible with quantum mechanics". The argument is based on a GHZ-like contradiction between constraints satisfied by measurement outcomes in an extended Wigner's friend scenario. Here we present a strengthened version of the argument, and show why, contrary to the claim by Lawrence et al., these arguments do not contradict the consistency of a theory of relative facts. Rather, considering this argument helps clarify how one should not think about a theory of relative facts, like RQM.
More Related Videos
Related Concept Videos
Perceptual Constancy
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Cognitive Dissonance
Principle of Equivalence
Estimation of the Physical Quantities
Relative Velocity in One Dimension
Relative Frequency Distribution

