Stationary line of N Kerr masses kept apart by gravitational spin-spin interaction

The metric is presented, in terms of six determinants of degree N, in a concise closed form, describing N collinear isolated Kerr masses (N = 1,2,3,. . .) balanced by their gravitational spin-spin interaction. Two hitherto unnoticed potentials L and M are introduced to evaluate the metric function ω. The conditions for regularity of the metric on the symmetrical axis are presented