 reserve x,y,X,Y for set;
reserve G for non empty multMagma,
  D for set,
  a,b,c,r,l for Element of G;
reserve M for non empty multLoopStr;

theorem Th17:
  for M being non empty multLoopStr st M is well-unital holds
    1.M = the_unity_wrt the multF of M by BINOP_1:def 8;
