| #### D.15.11.9 isGroup Procedure from library `multigrading.lib` (see multigrading_lib). Usage: isGroup(G); G a list Purpose: checks whether G is a valid group Note: G should be created by createGroup (or createQuotientGroup, createTorsionFreeGroup) Return: int, 1 if G is a valid group and 0 otherwise Example:
    LIB "multigrading.lib";
    intmat S[3][3] =
    1, 0, 0,
    0, 1, 0,
    0, 0, 1;
    intmat L[3][2] =
    1, 1,
    1, 3,
    1, 5;
    def G = createGroup(S, L); // (S+L)/L
    isGroup(G);
    ==> 1
    printGroup(G);
    ==> Generators:
    ==>      1     0     0
    ==>      0     1     0
    ==>      0     0     1
    ==> Relations:
    ==>      1     1
    ==>      1     3
    ==>      1     5

User manual for Singular version 4.3.2, 2023, generated by texi2html.