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D.15.14.7 grtwist

Procedure from library gradedModules.lib (see gradedModules_lib).

Usage:
grtwist(a,d), int a, d

Return:
graded object representing S(d)^a

Purpose:
compute presentation of S(d)^a

Example:
 
LIB "gradedModules.lib";
ring r=32003,(x,y,z),dp;
//  grview(grpower( grshift(grzero(), 10), 5 ) );
grview( grtwist (5, 10) );
==> Graded homomorphism: r(10)^5 <- 0, given by zero (5 x 0) matrix.