Feigenbaum reduction parameter
2.502907875095892822283902873218215786381271376727149977336192056
Feigenbaum bifurcation velocity constant
4.669201609102990671853203820466201617258185577475768632745651343 00413433021131473
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Fransen-Robinson constant.
2.80777024202851936522150118655777293230808592093019829122005
ref:
Math of Computation, vol 34 1980 pp 553-566
Math of Computation vol 37 1981 pp 233-235
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The Gauss-Kuzmin-Wirsing constant.