The approximation operator for every kind of the objective function is different in approximation Theory.
在逼近问题中，对于不同的目标函数，采用的逼近算子也有所不同。
To characterize the pointwise multiplier of function space has the direct meaning to study the operator theory and property of function space.
函数空间点乘子的刻划对研究函数空间算子理论和函数空间性质有着直接的意义。
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