| #### D.6.17.2 invunit Procedure from library `mondromy.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. Example:
    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

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