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D.12.2.15 powerX

Procedure from library crypto.lib (see crypto_lib).

Usage:
powerX(q,i,I);

Return:
the q-th power of the i-th variable modulo I

Assume:
I is a standard basis

Example:
 
LIB "crypto.lib";
ring R = 0,(x,y),dp;
powerX(100,2,std(ideal(x3-1,y2-x)));
==> x2

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