In introductory textbooks (Griffiths, Shankar, Boas) a tensor is introduced as a mathematical objects which transform in a specific manner under changes of basis (i.e. changes of the coordinate system). Specifically, a 0-rank tensor (also called scalars) is independent of such changes, whereas an...

I am learning the basics of Thermodynamics. Everywhere I read about the first law, it states "conservation of energy", and talks about how internal energy equals heat and work transfer. I am aware of work transfer being considered positive and negative depending on the point of view we want to ...

First a quick recap because maybe my understanding/assumptions are flawed (you can jump to the question highlighted in bold below if you like to): Bell's inequalities require that an accurate(ly predictive) theory cannot include local realism (or have local hidden variables). Bell's theorem,...