 Dangerous cases are those in which excessively small values of the parameter "u" = "x" (and hence also |"p"1| ≈ "x") appear at the end of an era.A criterion for selection of such cases is the inequality
where | α("s") | is the initial minima depth of the functions that oscillate in era "s" (it would be more appropriate to choose the final amplitude, but that would only strengthen the selection criterion).The value of "x"(0) in the first era is determined by the initial conditions.