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A new matrix representation for low-energy limit of heterotic string theoryreduced to three dimensions is considered. The pair of matrix Ernst Potentialsuniquely connected with the coset matrix is derived. The action of the symmetrygroup on the Ernst potentials is established.Comment: 10 pages in LaTe

MATRIX ERNST POTENTIALS AND ORTHOGONAL SYMMETRY OF LOW ENERGY HETEROTIC STRING THEORY REDUCED TO THREE DIMENSIONS