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7.5.14.0. rightModulo
Procedure from library nctools.lib (see nctools_lib).
- Usage:
- rightModulo(M,N); M,N are ideals/modules
- Purpose:
- compute a right representation of the module (M+N)/N
- Return:
- module
- Assume:
- M,N are presentation matrices for right modules
Example:
| | LIB "nctools.lib";
LIB "ncalg.lib";
def A = makeUsl(2);
setring A;
option(redSB);
option(redTail);
ideal I = e2,f2,h2-1;
I = twostd(I);
print(matrix(I));
==> h2-1,fh-f,eh+e,f2,2ef-h-1,e2
ideal E = std(e);
ideal TL = e,h-1; // the result of left modulo
TL;
==> TL[1]=e
==> TL[2]=h-1
ideal T = rightModulo(E,I);
T = rightStd(T+I);
T = rightStd(rightNF(T,I)); // make the output canonic
T;
==> T[1]=h+1
==> T[2]=e
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