The equality conjecture for the homotopy-exponent valuation bound

About 21 years old · traced to

Let pp be any prime, let α,l∈N\alpha,l\in\mathbb{N}, and let n,r∈Zn,r\in\mathbb{Z} with n≥2pα−1n\ge 2p^{\alpha}-1. The theorem gives a lower bound for the pp-adic valuation of the relevant quantity RR in terms of τp({r}pα,{n−r}pα)\tau_p(\{r\}_{p^{\alpha}},\{n-r\}_{p^{\alpha}}). Equality conjecture. Equality in Theorem is attained whenever l≥⌊n/pα⌋l\ge\lfloor n/p^{\alpha}\rfloor and

l≡⌊rpα⌋+⌊n−rpα⌋ (mod⁡ (p−1)p⌊log⁡p(n/pα)⌋).l\equiv\left\lfloor\frac{r}{p^{\alpha}}\right\rfloor+\left\lfloor\frac{n-r}{p^{\alpha}}\right\rfloor\ \left(\operatorname{mod}\ (p-1)p^{\lfloor\log_p(n/p^{\alpha})\rfloor}\right).

The claim is based on extensive Maple calculations; the source provides no proof or resolution, so its status remains open.

References

Primary source

Donald M. Davis and Zhi-Wei Sun, “A number-theoretic approach to homotopy exponents of SU(n)”, arXiv:math/0508083 (2006).

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