reserve i,j,k,n for Nat;
reserve D for non empty set,
  p for Element of D,
  f,g for FinSequence of D;

theorem Th37:
  for f, g being FinSequence holds (f^g)/^(len f) = g
proof
  let f, g be FinSequence;
  thus (f^g)/^(len f) = (f^g)/^(len f + 0) .= g/^0 by Th36
    .= g;
end;
