b=isLogarithmic(M,I)
b=isLogarithmic(V,I)
b=isLogarithmic(m,I)
Check if the vector field(s) given are in the module of logarithmic vector fields of I (see derlog). This function does not compute derlog(I), but instead applies the vector fields to the generators of I and checks if the result lies in I.
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The object isLogarithmic is a method function.