"The problem of the interrelationship of several observers," handwritten notes, circa 1955
Everett, Hugh
Abstract
Among Hugh Everett's files were a number of handwritten documents related to the writing of his thesis. Some of them were early notes on ideas and material that ultimately appeared in the long thesis. This document, entitled "The problem of the interrelationship of several observers" by Everett, was found in a file labeled "Random notes". It describes a very early version of the Wigner's friend thought experiment.