# ApCoCoA-1:DA.Sep

From ApCoCoAWiki

## DA.Sep

Computes the separand of a differential polynomial.

### Syntax

DA.Sep(F:POLY):POLY

### Description

DA.Sep returns the separand of polynomial F wrt. the current differential term ordering, or the hereby induced ranking, respectivly.

The seperand of F is just the initial of the derivative of F.

@param F A differential polynomial.

@return The seperand of F wrt. to the current differential term ordering.

#### Example

Use Q[x[1..2,0..20]]; Use Q[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]; G:=DA.Differentiate(F); DA.Initial(G); ------------------------------- 2x[1,2]^3x[2,2] + 2x[1,1]^3x[2,2] ------------------------------- DA.Sep(F); ------------------------------- 2x[1,2]^3x[2,2] + 2x[1,1]^3x[2,2] -------------------------------