= Feigenbaum geometric potential
{c}
{title2=$-B\leq U\leq-b<0$}
The geometric symbolic potential for the <Feigenbaum period-doubling map> has uniformly negative bounded values and exponentially decreasing variations. Potential sums describe logarithmic lengths of odd-address period-doubling intervals up to a uniform additive error. This is a geometric scaling potential, distinct from an unbounded derivative potential at a critical point. Its pressure is continuous, strictly decreasing and convex by the <almost-additive partition-function limit> and finite-volume inequalities.
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