Object of class
Integer vector. Elements denote variables to differentiate with respect to
Further arguments, currently ignored
deriv(S,v) returns \mjeqn\frac\partial^r S\partial
v_1\partial v_2...\partial v_rd^rS/dv1...dvr.
The Leibniz product rule\mjdeqn\left
(u\cdot v\right)'=uv'+u'vomitted; see latex
operates even if (as here) u,v do not commute.
A term of a
freealg object can include negative values which
correspond to negative powers of variables. Thus:
1 2 3 4 5 6 7 8
(see also the examples). Vector
r may include negative integers
which mean to differentiate with respect to the inverse of the variable:
1 2 3 4 5 6 7
deriv() calls helper function
which is documented at
Robin K. S. Hankin
1 2 3 4 5 6
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