Wiki
Wiki

Research notes on every problem, and a library of the papers behind them. Built from the open erdos repository.

Updated


Claim. The account herong, in a comment of 17 September 2026 (the claim's date) on the site's discussion thread, reports an independent decider for the statement of Problem 583 on small graphs. It prunes with a lower bound on the number of paths inside each component CC of the uncovered part, the largest of 11, ⌈oddC/2⌉\lceil\mathrm{odd}_C/2\rceil, ⌈ΔC/2⌉\lceil\Delta_C/2\rceil and ⌈mC/(nC−1)⌉\lceil m_C/(n_C-1)\rceil, summed over the components; the ⌈Δ/2⌉\lceil\Delta/2\rceil term is new (a simple path uses at most two edges at a vertex). Its exhaustive sweeps at n=9n=9, 1010 and 1111 (261,080261{,}080, 11,716,57111{,}716{,}571 and 1,006,700,5651{,}006{,}700{,}565 connected graphs, the shard counts checked against OEIS A001349) find no counterexample and nothing undecided. As a control, on all 261,080261{,}080 connected graphs of order 99 with the path budget cut to 44 and then to 33, its decider and the search of the earlier comment by sallerk, fitted with the same bound, report identical sets of undecomposable graphs. The code and logs are in a public repository, linked above at its commit of 17 September 2026, and the comment discloses that the decider and the write-up were prepared with assistance from Claude (Anthropic).

Covers. Connected graphs on at most 1111 vertices. Nothing for n≥12n\ge12: the n=12n=12 sweep (164,059,830,476164{,}059{,}830{,}476 graphs) was reported as running, and no outcome was posted.

Depends on. Nothing in this wiki.

Standing. Claimed: a forum computation, which the site does not verify, independent of and agreeing with sallerk's check; not reviewed and given no credit by this corpus, which has not run it. The claim is partial, so the problem's standing is unchanged by it.