1. Computing the Symbol
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چکیده
In this section, we compute the symbol of the scattering matrix-in particular given two magnetic fields which agree to some order, we compute the principal symbol of the difference of the associated scattering matrices in terms of the lead term of the difference of the magnetic fields. We use the techniques of [8], [5] and [4] to construct the Poisson operator and compute the symbols. We proceed explicitly where possible but occasionally fall back on results from [8] for brevity.
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تاریخ انتشار 1999