A brief introduction to the Foundations of Quantum Theory and an analysis of the Frauchiger-Renner paradox

Daniel V. Tausk

Published 2018-12-28Version 1

This is a short text covering some topics on the Foundations of Quantum Theory and it includes some comments on the recent Nature article by D. Frauchiger and R. Renner. The so-called "paradox" is simply due to a misunderstanding on the appropriate way to apply the quantum mechanical rules. The text is meant to be accessible to non physicists and the math is kept to a minimum (just some Linear Algebra and extremely elementary Probability Theory).