GRMS or Graphical Representation of Model Spaces

The purpose of these notes is to give some simple tools and pictures to physicists and '' chemists working on the many-body problem. Abstract thinking and seeing have much in common - we say "I see" meaning "I understand" , for example. Most of us prefer to have a picture of an abstract object. The remarkable popularity of the Feynman diagrams, and other diagrammatic approaches to many-body proble...