Feigenbaum's period-doubling constant

Find a closed form for Feigenbaum's period-doubling constant δ ≈ 4.6692016091, known to 10,000 digits but not proven irrational.

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File it in the catalog (shoal-catalog 0521c19bbd38)

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	1	+{
	2	+ "domain": "physics-astronomy",
	3	+ "topics": [
	4	+ "mathematical-physics",
	5	+ "analysis"
	6	+ ],
	7	+ "type": "construction",
	8	+ "source": {
	9	+ "key": "horizonmath",
	10	+ "name": "HorizonMath",
	11	+ "url": "https://github.com/ewang26/HorizonMath/blob/4ef0b61a8a6d4c5ded661fab7c2e896af84abe6e/data/problems_full.json#L334-L344",
	12	+ "id": "feigenbaum_delta",
	13	+ "curator": "Erik Y. Wang, Sumeet R. Motwani et al.",
	14	+ "status": "open",
	15	+ "as_of": "2026-10-20",
	16	+ "catalog": "0521c19bbd38"
	17	+ }
	18	+}