Abstract
The usefulness of the Bogolubov transformations in variational calculations is demonstrated using the massive Thirring model as a specific example. It is shown that such transformations can be chosen so that the expectation value of the Hamiltonian is regulator independent when the exact form of the counterterms is used. Moreover enough freedom is left to optimize the variational state as a trial vacuum. The problem of dealing with the anomalous commutators that arise in the model is discussed.
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