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DoubleFactorial(System.Numerics.Complex)
Method (no overloads)
Summary
The double factorial: n (n - 2) ... down to 1 or 2 for a whole n >= 0 ,
(n + 2)!!/(n + 2) for a negative odd one, and no value for a negative even one or for
any number that is not whole.
any number that is not whole.
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