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We present an analysis of the Frauchiger-Renner Gedankenexperiment from thepoint of view of the relational interpretation of quantum mechanics. Ouranalysis shows that the paradox obtained by Frauchiger and Renner disappears ifone rejects promoting one agent's certainty to another agent's certainty whenit cannot be validated by records from the past. A by-product of our analysisis an interaction-free detection scheme for the existence of such records.

Relational analysis of the Frauchiger--Renner paradox and interaction-free detection of records from the past