P(t) is, of course, the Perfection of Time function, while h(t) is a function representing the normal course of history, and f(t) is the fractured line correspondence function, which goes to 0 when the map between the spaces H and F is no longer onto. t itself being a function of space and the Zeitsgeschlaeger function psi, we see clearly here that, to maintain the integrity of the hypercube of spacetime, zeitsgeschlaegers need to exist.