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D.12.1.7 powerpolyX

Procedure from library aksaka.lib (see aksaka_lib).

Usage:
powerpolyX(q,n,a,r);

Return:
the q-th power of poly a modulo poly r and number n

Example:
 
LIB "aksaka.lib";
ring R=0,x,dp;
poly a=3*x3-x2+5;
poly r=x7-1;
bigint q=123;
bigint n=5;
powerpolyX(q,n,a,r);
==> 3x5+2x4+x3+x2+1