_zseries_mul(z1, z2)
Multiply two z-series to produce a z-series.
This is simply convolution. If symmetric/anti-symmetric z-series are denoted by S/A then the following rules apply:
S*S, A*A -> S S*A, A*S -> A
The arrays must be 1-D but this is not checked.
The product z-series.
Multiply two z-series.
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