GROUP THEORY SYMBOL
GTSGGetInvSubGroup
GTSGGetInvSubGroup[space group, classes, basis, index]
gives an invarian subgroup of the factor group G/T (G being a space group, T the group of pure lattice translations) with a specified index
GTSGGetInvSubGroup[space group, classes, basis, index]
gives an invarian subgroup of the factor group G/T (G being a space group, T the group of pure lattice translations) with a specified index