"Exactly solvable models (that is, models with explicitly and completely diagnolizable hamiltonians) are too few in number, and sufficiently diverse, to meet the requirements of modern quantum physics. Quasi exactly solvable (QES) models (whose hamiltonians admit an explicit diagonalization only for some limited segments of the spectrum) provide a practical way forward. Although QES models are a recent discovery, the results are already numerous. This book collects them together, and expounds them in a unified and accessible form, providing an invaluable resource for any physicists using quantum mechanics and applied mathematicians dealing with linear differential equations."
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