|  |  D.12.4.12 cantormult Procedure from libraryhyperel.lib(see  hyperel_lib).
 
Example:Usage:
cantormult(m,D,h,f);
Return:
list res=m*D
Note:
important: Divisor D has to be semireduced!
Uses repeated doublings for a faster computation
 of the reduced divisor m*D.
 Attention: Factor m=int, this means bounded.
 For m<0 the inverse of m*D is returned.
 The divisors are defined over the basering.
 Curve C: y^2+h(x)y=f(x) is defined over the basering.
 
 |  | LIB "hyperel.lib";
ring R=7,x,dp;
// hyperelliptic curve y^2 + h*y = f
poly h=x;
poly f=x5+5x4+6x2+x+3;
// reduced divisor
list D=x2-1,2x-1;
cantormult(34,D,h,f);
==> [1]:
==>    x2-3x-3
==> [2]:
==>    x+1
 | 
 
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