ApCoCoA-1:DA.InitialOfDer
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Revision as of 09:06, 22 December 2008 by S schuster (talk | contribs)
diffalg.InitialOfDer
the initial wrt. a given derivative
Syntax
$diffalg.InitialOfDer(F:POLY, X:INDET):POLY
Description
InitialOfDer returns the polynomial leading coefficient of polynomial F regarded as polynomial in the derivative X.
Example
Use Q[x[1..2,0..20]];
Use Q[x[1..2,0..20]], Ord($diffalg.DiffTO("Lex"));
F:=x[1,2]^3x[2,2]^2 + x[1,1]^3x[2,2]^2 + 1/4x[1,2];
$diffalg.InitialOfDer(F, x[1,2]);
-------------------------------
x[2,2]^2
-------------------------------
