|
 |
 |
 |
 |
 |
 |
 |
 |
 |
D.6.13.2 invunit
Procedure from librarymondromy.lib (see mondromy_lib).
- Usage:
- invunit(u,n); u poly, n int
- Assume:
- The polynomial u is a series unit.
- Return:
- The procedure returns the series inverse of u up to order n
or a zero polynomial if u is no series unit.
- Display:
- The procedure displays comments if printlevel>=1.
LIB "mondromy.lib"; ring R=0,(x,y),dp; invunit(2+x3+xy4,10); ==> 1/8x2y8-1/16x9+1/4x4y4+1/8x6-1/4xy4-1/4x3+1/2 |