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7.7.19.0. WeylClosure1
Procedure from library dmodloc.lib (see dmodloc_lib).

Usage:
WeylClosure1(L); L a poly

Assume:
The basering is the first Weyl algebra D=K<x,d|dx=xd+1> over a field K of characteristic 0.

Return:
ideal, the Weyl closure of the principal left ideal generated by L

Remarks:
The Weyl closure of a left ideal I in the Weyl algebra D is defined to be the intersection of I regarded as left ideal in the rational Weyl algebra K(x)<d> with the polynomial Weyl algebra D.
Reference: (Tsa), Algorithm 1.2.4

Note:
If printlevel=1, progress debug messages will be printed, if printlevel>=2, all the debug messages will be printed.

Example:
 
See also: WeylClosure.


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