multi pseudo differential operators
multi pseudo differential operators
多重伪微分算子
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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In this paper we will study the pseudo-differential operators P which satisfy conditions 1-4(or 4'). They constitute a class of hyperbolic operators with multi-characteristics.
本文对满足条件1-4（或4＇）的一类具重特征的双曲拟微分算子（1）进行初步的讨论。
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