# 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 -------------------------------