$A_n^{(1)}$ Toda Solitons: a Relation between Dressing transformations and Vertex Operators

Affine Toda equations based on simple Lie algebras arise by imposing zero curvature condition on a Lax connection which belongs to the corresponding loop Lie algebra in the principal gradation. In the particular case of $A_n^{(1)}$ Toda models, we exploit the symmetry of the underlying linear problem to calculate the dressing group element which generates arbitrary $N$-soliton solution from the vacuum. Starting from this result we recover the vertex operator representation of the soliton tau functions.

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