Beautiful Models: 70 Years Of Exactly Solved Quantum Many-body ProblemsThis invaluable book provides a broad introduction to the fascinating and beautiful subject of many body quantum systems that can be solved exactly. The subject began with Bethe's famous solution of the one dimensional Heisenberg magnet more than 70 years ago, soon after the invention of quantum mechanics. Since then, the diversity and scope of such systems have been steadily growing. Beautiful Models is self contained and unified in presentation. It