sm1.mul
sm1.mul_h
is for homogenized Weyl algebra.
sm1.mul(p0*dp0,1,[p0])
returns
dp0*p0+1
.
A variable order such that d-variables come after non-d-variables
is necessary for the correct computation.
[277] sm1.mul(dx,x,[x]); x*dx+1 [278] sm1.mul([x,y],[1,2],[x,y]); x+2*y [279] sm1.mul([[1,2],[3,4]],[[x,y],[1,2]],[x,y]); [[x+2,y+4],[3*x+4,3*y+8]]
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