The file tgroupisom.gi contains the GAP code corresponding to the paper 'The isomorphism problem for torsion free nilpotent groups of Hirsch length at most 5' by Bettina Eick and Ann-Kristin Engel. The following functions are available: * IsomEq_211() -- determines the equations (1)-(3) for Theorem 10 * AutoEq_211() -- determines the equations for Theorem 12 * IsomEq_311() -- determines the equations (1)-(4) for Theorem 15 * AutoEq_311() -- determines the equations for Theorem 17 * IsomEq_2111() -- determines the equations (1)-(7) for Lemma 20 * CanoEq_2111() -- determines the equations for Corollary 22 * AutoEq_2111() -- determines the equations for Theorem 23 * IsomEq_212() -- determines the equations (1)-(3) for Theorem 26 * AutoEq_212() -- determines the equations for Theorem 29