Abstract
Correct quantum Hamiltonians of a few exactly solvable models in two space-time dimensions are derived by taking into account operator solutions of the field equations. While two versions of the model with derivative coupling are found to be equivalent in many respects to a free theory, physical vacua of the massless Thirring and Federbush models are obtained by means of a Bogoliubov transformation in the form of a coherent state quadratic in composite boson operators. Contrary to the conventional treatment, the Federbush model is shown to have the same interacting structure in both space-like and light-front formulations.
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