KASH3 Ref - Derivative

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| ### Function Derivative ( elt-rng^ser f, elt-ord^rat k ) -> elt-rng^ser ### Description The k-th derivative of f with respect to its variable. ### Examples x_P := PuiseuxSeriesRing(Q); x_RP:=PolynomialAlgebra(x_P); x_y := x_RP.1; x_f := x_RP.1^2 -x_RP.1^3 + x_RP.1 +1; x_exp:=PuiseuxExpansion(x_f,0); Derivative(x_exp[1],2);
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