Definition:Feigenbaum Constants/Second

Definition
The secondFeigenbaum constant $\alpha$ is the ratio between the width of a tine and the width of one of its two subtines (except the tine closest to the fold).

A negative sign is applied to $\alpha$ when the ratio between the lower subtine and the width of the tine is measured.

Its approximate value is given by:
 * $\alpha \approx 2 \cdotp 50290 \, 78750 \, 95892 \, 82228 \, 39028 \, 73218 \, 21578 \cdots$

Also known as
The second Feigenbaum constant is also referred to as merely the Feigenbaum reduction parameter.

Also see

 * Definition:First Feigenbaum Constant