4-4：The convolution property（卷积性质） 这是最重要的性质。 x1(t)←→X1(jω)，x2(t)←→X2(jω)，则x1(t)*x2(t)←→X1(jω).X2(jω) 即时域的卷积对应频域的乘积。
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特别地，证明了这两个子类的几个包含关系、积分算子和卷积性质。
In particular, several inclusion relations, integral operators and convolution properties for each of these function classes are proven.
然后重点分析了基于DFT的时域循环卷积性质的选择映射（SLM）方法，提出了一种基于SLM的改进方法。
Secondly, a SLM method based on the DFT property of the time domain circular convolution is studied.
文中给出了二阶卷积算子的定义和性质并举例说明。
The second order convolution operators are defined and several properties are discussed.
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