DeWitt’s article, “Quantum Mechanics and Reality,” did review several interpretations. But DeWitt made his own opinions quite clear. “The Copenhagen view promotes the impression that the collapse of the [wave function], and even the [wave function] itself, is all in the mind,” he wrote. “If this impression is correct, then what becomes of reality? How can one treat so cavalierly the objective world that obviously exists all around us?” When dealing with a system in a quantum superposition, like Schrödinger’s cat, DeWitt said most physicists “conceive the [measurement device] to have entered a
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