A Forced-Structure Reduction and Verifiable Bounds for Conway's 99-Graph.

arXiv:2608.11211v2 Announce Type: replace Abstract: Conway's 99-graph problem asks whether a strongly regular graph with parameters $\mathrm{srg}(99,14,1,2)$ exists. We develop two complementary lines of attack. Fixing one vertex, the conditions $\lambda=1$ an