In this paper, a conic subset Γ of R 2×R 2 is constructed, and by use of the Hilbert transform along a vector field, it is proved that the pseudo differential operator, whose symbol is the characteristic function of Γ, is unbounded on L 2(R 2).
本文构造了R2 ×R2 中的一个锥子集Γ,以沿向量场的Hilbert 变换为工具,证明了以Γ的特征函数为象征的拟微分算子在L2( R2) 中是无界的。
Lithodemic Creation and Emplacement Mechanism of the Zhuizishan Composite Pluton in Hebei;
河北锥子山复式深成杂岩体岩石谱系单位的建立及就位机制
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