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It is shown that exact solvability of the finite temperature masslessThirring model, as well as of its zero temperature case, in canonicalquantization scheme originates from the intrinsic hidden exact linearizabilityof Heisenberg equations by means of dynamical mapping onto the Schr\"odingerphysical fields. The normal forms of different one- and two- parametric(thermo) field's solutions are obtained. They are connected with each other bymaking use of generalized conformal shift transformations. The sequential useof bosonic canonical transformations provides a correct renormalization,anticommutation and symmetry properties of these solutions. The dynamical roleof inequivalent representations of 1+1-D free massless Dirac fields, that areinduced by inequivalent representations of 1+1-D free massless (pseudo) scalarfield, and the appearance of Schwinger terms are elucidated. The inequivalentvacuum is established as coherent state for SU(1,1) group. A new alternativesources of superselection rules are shown. A generalization of Ojima tildeconjugation rules is suggested, which reveals the properties of coherent statefor SU(2) group for the fermionic thermal vacuum state and is useful for thethermofield bosonization. The notions of "hot" and "cold" thermofields areintroduced to distinguish different thermofield representations giving thecorrect normal form of thermofield solution. The weak sense of definition ofzero and finite temperature operator bosonization rules in the framework ofthermofield dynamics is demonstrated.

Finite temperature Thirring model: from linearization through canonical transformations to correct normal form of thermofield solution