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.

中文翻译：

---

论相关事实的一致性

劳伦斯等人。提出了一个论点，旨在表明“相对事实不存在”，因此“关系量子力学与量子力学不相容”。该论证基于扩展维格纳友元场景中测量结果所满足的约束之间类似 GHZ 的矛盾。在这里，我们提出了该论证的强化版本，并展示了为什么与劳伦斯等人的主张相反，这些论证并不与相对事实理论的一致性相矛盾。相反，考虑这一论点有助于澄清人们不应如何思考相对事实理论，例如 RQM。