x_PA:= PolynomialAlgebra(FiniteField(5));; x_f:= Coerce(x_PA,X^2+2);; x_PSR:= PowerSeriesRing(FiniteField(5),x_f);; x_Quo:= Quotient(x_PSR,20);; x_Quox:= PolynomialAlgebra(x_Quo);; x_ff:= x_Quox.1^2+Element(x_Quo,[1,2,3])*x_Quox.1-2; Derivative(x_ff);