Procedure from library freegb.lib (see freegb_lib).
Usage:
lpMult(f,g); f,g letterplace polynomials
Return:
poly
Assume:
basering has a letterplace ring structure
Purpose:
compute the letterplace form of f*g
Example:
LIB "freegb.lib";
// define a ring in letterplace form as follows:
ring r = 0,(x(1),y(1),x(2),y(2),x(3),y(3),x(4),y(4)),dp;
def R = setLetterplaceAttributes(r,4,2); // supply R with letterplace structure
setring R;
poly a = x(1)*y(2)+x(1)+y(1); poly b = y(1)+3;
lpMult(b,a);
==> y(1)*x(2)*y(3)+y(1)*x(2)+3*x(1)*y(2)+y(1)*y(2)+3*x(1)+3*y(1)
lpMult(a,b);
==> x(1)*y(2)*y(3)+4*x(1)*y(2)+y(1)*y(2)+3*x(1)+3*y(1)
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