| #### D.4.16.38 tensorModule Procedure from library `modules.lib` (see modules_lib). Return: Tensorprodukt of M,N Example:
    LIB "modules.lib";
    ring R = 0,(x,y,z),dp;
    matrix a[1][2] = x,y;
    Matrix A = a;
    matrix b[1][2] = x2,y2;
    Matrix B = b;
    Module M = subquotient(A,B);
    M;
    ==> subquotient (| x y |, | x2 y2 |)
    ==>
    ==>
    matrix c[2][2]=x,y2,z,xz;
    Matrix C=c;
    matrix d[2][3]=z2,xyz,x2y2,xy,x3,y4;
    Matrix D=d;
    Module N = subquotient(C,D);
    N;
    ==> subquotient (| x y2 |, | z2 xyz x2y2 |)
    ==>              | z xz |  | xy x3  y4   |
    ==>
    ==>
    tensorModule(M,N);
    ==> cokernel | 0 x -y 0 0 0  -xyz+y2 0       x2z-xyz 0       y4-xyz2-x2z+xyz+\
       y2z-y2 0                      -xy2z-y3z+xy2+y3+x2z-xyz+xz2+y2 0          \
                            -y3z+xz2 0        xy2z2-xy2z-y3z+y3 0               \
         y4z-y4-x2z2+xyz2+x2z-xyz-y2z+y2 0                               xy3z-xy\
       3+xy2z+y3z-xy2-y3-x2z+xyz-xz2-y2 0                                       \
       0       0       x2y2z-x2y2+xy2z+y3z-xy2-y3-x2z+xyz-xz2-y2 0              \
                                  |
    ==>          | y 0 x  0 0 0  0       -xyz+y2 0       x2z-xyz 0               \
              y4-xyz2-x2z+xyz+y2z-y2 0                               -xy2z-y3z+x\
       y2+y3+x2z-xyz+xz2+y2 0        -y3z+xz2 0                 xy2z2-xy2z-y3z+y\
       3 0                               y4z-y4-x2z2+xyz2+x2z-xyz-y2z+y2 0      \
                                        xy3z-xy3+xy2z+y3z-xy2-y3-x2z+xyz-xz2-y2 \
       0       0       0                                         x2y2z-x2y2+xy2z\
       +y3z-xy2-y3-x2z+xyz-xz2-y2 |
    ==>          | 0 0 0  0 x -y z2-x    0       0       0       -xy2+z3-z2+x    \
              0                      -y2z+yz2-x2-xy-xz+z2-x          0          \
                            0        0        -yz3+x2z+yz2-xy   0               \
         xy2-z3+z2-x                     0                               -y2z2+x\
       2y+y2z-yz2+x2+xy+xz-z2+x         0                                       \
       xyz-y2z 0       -xyz2+x3+y2z-yz2+x2+xy+xz-z2+x            0              \
                                  |
    ==>          | 0 0 0  y 0 x  0       z2-x    0       0       0               \
              -xy2+z3-z2+x           0                               -y2z+yz2-x2\
       -xy-xz+z2-x          0        0        0                 -yz3+x2z+yz2-xy \
         0                               xy2-z3+z2-x                     0      \
                                        -y2z2+x2y+y2z-yz2+x2+xy+xz-z2+x         \
       0       xyz-y2z 0                                         -xyz2+x3+y2z-yz\
       2+x2+xy+xz-z2+x            |
    ==>
    ==>

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