I want to understand Multi-scale Entanglement Renormalization Ansatz (MERA) with very elementary examples. So far I could find references which are mostly based on numerics. It would be a great help if someone could give a very simple example explaining the basic concepts of MERA or give some references (papers/theses/reviews) that implement the operations (i.e, isometry and disentangler) in analytic fashion (even for a simplest possible system).
Actually, I do not have any 'practical' knowledge about tensor networks in general as I am from theoretical HEP background. So references on (analytic) MPS or PEPS with simple examples will be really useful.