Solution of these equations give the values of s at the
local maximum or minimum. Substitution back into
Eq. (17) yields the corresponding values for After
eliminating the false solutions (negative or complex 0,
the remaining values correspond to break-in, break-out,
and reversal points. Therefore, Rule 2 states "Break-in,
break-out, and reversal points on the real axis are given
by the solution of Eqs. (1 8) and (17)".