Singular Manual: isSublattice

| #### D.15.18.15 isSublattice Procedure from library `multigrading.lib` (see multigrading_lib). Usage: isSublattice(L, S); L, S are of tpye intmat Purpose: checks whether the lattice created by L is a sublattice of the lattice created by S. The procedure checks whether each generator of L is contained in S. Return: integer, 0 if false, 1 if true Example:
    LIB "multigrading.lib";
    //ring R = 0,(x,y),dp;
    intmat S2[3][3]=
    0, 2, 3,
    0, 1, 1,
    3, 0, 2;
    intmat S1[3][2]=
    0, 6,
    0, 2,
    3, 4;
    isSublattice(S1,S2); // Yes!
    ==> 1
    intmat S3[3][1] =
    0,
    0,
    1;
    not(isSublattice(S3,S2)); // Yes!
    ==> 1

User manual for Singular version 4-1-0p2, 2017, generated by texi2html.