And then, we have two cases. So, the case where the system is invertible corresponds to the general situation where your three planes somehow all just intersect in one point.
有两种可能，一是方程组可逆，这就是一般情况了，这时三个平面交于一点。
The mixing system is composed of a linear convolution followed by an invertible nonlinear distortion.
混合系统由线性卷积混合后接一个可逆非线性失真组成。
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