Facts happen at every interaction, but they are not absolute: they are relative to the systems involved in the interaction. Stable facts are those whose relativity can effectively be ignored. In this work, we describe how stable facts emerge in a world of relative facts and discuss their respective roles in connecting quantum theory and the world. The distinction between relative and stable facts resolves the difficulties pointed out by the no-go theorem of Frauchiger and Renner, and is consistent with the experimental violation of the Local Friendliness inequalities of Bong et al.. Basing the ontology of the theory on relative facts clarifies the role of decoherence in bringing about the classical world and solves the apparent incompatibility between the ‘linear evolution’ and ‘projection’ postulates.

事实在每次交互中都会发生，但不是绝对的：它们与交互中涉及的系统有关。稳定的事实是那些相对性可以有效忽略的事实。在这项工作中，我们描述了稳定的事实如何在相对事实的世界中出现，并讨论了它们在连接量子理论和世界中的各自作用。相对事实和稳定事实之间的区别解决了Frauchiger和Renner的不通过定理指出的困难，并且与Bong等人的本地友好不等式的实验违反相一致。阐明了退相干在实现古典世界中的作用，并解决了“线性演化”和“投影”假设之间明显的不兼容问题。