m=derlog(I)
m=derlog(f)
n=derlogH(L)
n=derlogH(f)
derlog computes the module of logarithmic vector fields to an affine variety defined by I or f; these are the ambient vector fields tangent to the variety.
derlogH computes the module of ambient vector fields tangent to all level sets of f or of the entries of L.
Note that derlog(I)=der(I,I) and derlogH(L)=der(L,0); see der.
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Although every element of dH annihilates f, they do not annihilate the ideal generated by f:
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The object derlog is a method function.