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

Usage:
extendWeyl(S); S string or list of strings

Assume:
The basering is the n-th Weyl algebra over a field of characteristic 0 and for all 1<=i<=n the identity
var(i+n)*var(i)=var(i)*var(i+1)+1 holds, i.e. the sequence of variables is given by x(1),...,x(n),D(1),...,D(n), where D(i) is the differential operator belonging to x(i).

Return:
ring, Weyl algebra extended by vars given by S

Example:
 


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