02149nas a2200133   4500000000100000008004100001260001200042100001700054700002200071700002000093245007800113490000700191520181700198       2025                            d  c03/20251 aJay Lawrence1 aMarcin Markiewicz1 aMarek Żukowski00aRelational quantum mechanics is still incompatible with quantum mechanics0 v153 a<p>We showed in a recent article (Lawrence et al. <a href="https://link.springer.com/article/10.1007/s13194-025-00639-3#ref-CR3" id="ref-link-section-d73323868e391" title="Lawrence, J., Markiewicz, M., &amp; Żukowski, M. (2023). Relative Facts of Relational Quantum Mechanics are Incompatible with Quantum Mechanics. Quantum, 7, 1015. 
                  https://doi.org/10.22331/q-2023-05-23-1015
                  
                ">2023</a>. <em>Quantum, 7</em>, 1015), that relative facts (outcomes), a central concept in Relational Quantum Mechanics, are inconsistent with Quantum Mechanics. We proved this by constructing a Wigner-Friend type sequential measurement scenario on a Greenberger-Horne-Zeilinger (GHZ) state of three qubits, and making the following assumption: “if an interpretation of quantum theory introduces some conceptualization of outcomes of a measurement, then probabilities of these outcomes must follow the quantum predictions as given by the Born rule.” Our work has been criticized by Cavalcanti et al. (<a href="https://link.springer.com/article/10.1007/s13194-025-00639-3#ref-CR2" id="ref-link-section-d73323868e397" title="Cavalcanti, E. G., Di Biagio, A., &amp; Rovelli, C. (2023). On the consistency of relative facts. European Journal for Philosophy of Science., 13(4), 55. 
                  https://doi.org/10.1007/s13194-023-00551-8
                  
                . 
                  arXiv:2305.07343
                  
                ">2023</a>. <em>European Journal for Philosophy of Science, 13</em>(4),55). In this note we show that their critique, based on their own reformulation of our argument, does not apply to our paper. It also raises questions of principle which are not answered within the framework of Relational Quantum Mechanics.</p>