up previous next
DA.InitialOfDer

Computes the initial wrt. a given derivative.
Syntax
          
DA.InitialOfDer(F:POLY, X:INDET):POLY

          

Description
DA.InitialOfDer returns the polynomial leading coefficient of polynomial F regarded as polynomial in the derivative X.

Example
Use QQ[x[1..2,0..20]];
Use QQ[x[1..2,0..20]], Ord(DA.DiffTO("Lex"));

F:=x[1,2]^3x[2,2]^2 + x[1,1]^3x[2,2]^2 + 1/4x[1,2];

DA.InitialOfDer(F, x[1,2]);
-------------------------------
x[2,2]^2
-------------------------------


See Also