P1, A3 and A4 close, finishing Cayley CI
6
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Update 2026-08-24 (PST) (AI summary of creator comment): * A4 is the elementary abelian cell at odd primes p ≥ 5, deciding exactly which C_p^r are CI.
P1 is the six-family coprime assembly, putting together groups whose pieces have coprime orders, including the non-abelian shells.
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A4 = the elementary abelian cell at odd primes p ≥ 5 — deciding exactly which C_p^r are CI.
The neighbouring cells for contrast:
A3 is the same question at p = 3 (C_3^r), where the external record already has C_3^r non-CI for r ≥ 8 and the Morris ternary fire is the rank-eight wall.
P1 is the six-family coprime assembly — putting together groups whose pieces have coprime orders, including the non-abelian shells.