Recent content by fpaolini

I would like to know if the density matrix spectrum is always discrete or if it is possible it has a continuum spectrum. It is clear that a pure density matrix has a discrete spectrum but it is not obvious in general. I have heard that all compact operator has discrete eigenvalues and if it has...

That is me again. After some time studying the subject I made some improvement over my ideas. At the start of my study I have spent some time trying to understand an illustration about the concept of hidden variables ( The section 3 of chapter 2 of the "Speakable and Unspeakable in QM"...

Hi, I am trying to read the chapter 2 of the book "Speakable and Unspeakable in Quantum Mechanics" from J. Bell. I have got some doubts and I would be glad if someone could help me. I see that λ is a vector that makes the role of the hidden variable. All the tricks about the angles between...