Editing Feigenbaum constants (section)

==The second constant==
The '''second Feigenbaum constant''' or '''Feigenbaum reduction parameter'''<ref name=":0" /> {{mvar|α}} is given by {{OEIS|id=A006891}}:
:<math>\alpha = 2.502\,907\,875\,095\,892\,822\,283\,902\,873\,218\ldots</math>
It is the ratio between the width of a [[tine (structural)|tine]] and the width of one of its two subtines (except the tine closest to the fold). A negative sign is applied to {{mvar|α}} when the ratio between the lower subtine and the width of the tine is measured.<ref name="NonlinearDynamics">{{cite book |title=Nonlinear Dynamics and Chaos |first=Steven H. |last=Strogatz |series=Studies in Nonlinearity |publisher=Perseus Books |year=1994 |isbn=978-0-7382-0453-6 }}</ref>

These numbers apply to a large class of [[dynamical system]]s (for example, dripping faucets to population growth).<ref name="NonlinearDynamics" />

A simple rational approximation is {{sfrac|13|11}} × {{sfrac|17|11}} × {{sfrac|37|27}} = {{sfrac|8177|3267}}.