partial differential equation of parabolic type 抛物型偏微分方程 partial differential operator 偏微分算子 partial differentiation 偏微分法 ..
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流形上各种算子(如偏微分算子)的研究。
Study of all kinds of operators (such as partial differentia operators) on manifolds.
这个是符号化的向量算子，其中它的分量是偏微分算子。
That was this symbolic vector operator in which the components are the partial derivative operators.
由此得出了判别重特征线性偏微分算子亚椭园性和局部可解性的若干充分条件。
From this, we obtain some sufficient conditions for hypoellipticity and local solvability of those operators.
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