# The Physical Principles of the Quantum Theory

### Blurb

The Physical Principles of the Quantum Theory by Nobel laureate Werner Heisenberg and subsequently translated by Carl Eckart and Frank C. Hoyt. The book was first published in 1930 by University of Chicago Press. Then in 1949, according to its copyright page, Dover Publications reprinted the "unabridged and unaltered" 1930's version. The book discusses quantum mechanics and one 1931 review states that this is a "less technical and less involved account of the theor[y]". This work has been cited more than 1200 times.In the book, after briefly discussing various theories, including quantum theory, Heisenberg discusses the basis for the fundamental concepts of quantum theory. Also by this time Heisenberg has stated, "the interaction between observer and object causes uncontrollable and large changes in the [atomic] system being observed...". In this work Heisenberg also discusses his uncertainty principle or uncertainty relations.

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