David Albert - What theories qualify as quantum theories without observers?

This is a talk held at the conference "Quantum Theory without Observers III" (ZiF, Bielefeld, 22.04.-26.04.2013). There are also interviews with several of the participants available, see    • Quantum Theory without Observers III - Int...  . For more information have a look at the conference website http://www.mathematik.uni-muenchen.de...