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D.15.5.8 grtwists

Procedure from library gradedModules.lib (see gradedModules_lib).

Usage:
grtwists(v), intvec v

Return:
graded object representing S(v[1]) + ... + S(v[size(v)])

Purpose:
compute presentation of S(v[1]) + ... + S(v[size(v)])

Example:
 
LIB "gradedModules.lib";
ring r=32003,(x,y,z),dp;
grview( grtwists ( intvec(-4, 1, 6 )) );
==> Graded homomorphism: r(-4) + r(1) + r(6) <- 0, given by zero (3 x 0) matr\
   ix.
grview( grtwists ( intvec(0:0) ) );
==> Graded homomorphism: 0 <- 0, given by zero (0^2) matrix.