 The larger periods in which the scales of space distances along two axes oscillate while distances along the third axis decrease monotonously, are called "[[era]]s"; volumes decrease by a law close to ~ "t".On transition from one era to the next, the direction in which distances decrease [[Monotonic function|monotonously]], flips from one axis to another.The order of these transitions acquires the asymptotic character of a [[Stochastic process|random process]].