Abstract
Denote by L[u] a differential operator of the form $$L[u]\, = \,\sum\limits_{k = 0}^m {\,\,\sum\limits_{\begin{array}{*{20}{c}} {{i_1},..,{i_k}} \\ { = 1,...,n} \end{array}} {\,\,{A_{{i_1}}}{{...}_i}_{_k}} } \,(x)\,\frac{{{\partial ^k}u}}{{\partial {x_{{i_1}}}...\partial {x_{{i_k}}}}}$$ (3.1) .
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