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Erdős problem 349

For 0<α10 < \alpha \le 1 and any t>0t > 0, (t,α)(t, \alpha) is not a good pair: every term tαn\lfloor t\alpha^n\rfloor lies in the finite interval [0,t][0, \lfloor t\rfloor] (since αn1\alpha^n \le 1), so every subset sum is bounded by the constant i[0,t]i\sum_{i \in [0,\lfloor t\rfloor]} i, and no large integer can be a subset sum. A partial result on the open Erdős Problem 349, complementing the 2<α2 < \alpha and integer-coefficient cases.

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12 retained statements2415f78e850a

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FormalConjectures/ErdosProblems/

349.lean

Retained formal statement9 of 12

For any kk there exists some tk(0,1)t_k\in (0,1) such that the set of α\alpha such that the sequence tkαn\lfloor t_k\alpha^n\rfloor is complete consists of at least kk disjoint line segments.

FormalConjectures/ErdosProblems/349.leanErdos349.exists_t_for_k_disjoint_segments7 linesExact file
∀ (k : ℕ),tSet.Ioo 0 1,    ∃ ι,kSet.univ.encardI,          (∀ (i : ι), 2 ≤ (I i).encard ∧ (I i).NonemptyIsConnected (I i)) ∧            Pairwise (Function.onFun Disjoint I) ∧ ⋃ i, I i ⊆ {α | α > 0 ∧ Erdos349.IsGoodPair t α}
SolvedStatement only, no proof

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