Finiteness of the reverse uranium decay series
TheoremDB P11566 · nuclear physics
Problem statement
Consider radioactive decay chains that terminate at lead-206, . Read a chain backward, starting at and moving from each daughter nuclide to a possible radioactive parent. Are the lengths of all such reverse chains bounded, or can a reverse chain be extended to arbitrarily large mass numbers?
Lean 4
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Progress & source assessment
Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.
Open. No signed Lean verification is attached to this problem or its selected resolution.
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