Conjecture on intermediate differentials in the genuine C2C_2-equivariant Adams spectral sequence

Let MM denote the algebraic Mahowald invariant for the 2-primary Adams spectral sequence. For integers jj and kk with jk>0j\gg k>0, let s(k)s(k) and c(k)c(k) be the stem and coweight of M(h0k)M(h_0^k), respectively. The relevant values are

ks(k)c(k)4n+18n+14n4n+28n+24n4n+38n+34n4n+48n+74n+3\begin{array}{c|c|c} k&s(k)&c(k)\\ \hline 4n+1&8n+1&4n\\ 4n+2&8n+2&4n\\ 4n+3&8n+3&4n\\ 4n+4&8n+7&4n+3 \end{array}

Intermediate-differential conjecture. For jk>0j\gg k>0,

dk+1(θρ2jk+s(k)τ2j1)=θτ2j+2jk1+c(k)1M(h0k)hjk.d_{k+1}\left(\frac{\theta}{\rho^{2^{j-k}+s(k)}\tau^{2^j-1}}\right)=\frac{\theta}{\tau^{2^j+2^{j-k-1}+c(k)-1}}M(h_0^k)h_{j-k}.

This conjecture predicts a family of major intermediate differentials in the genuine C2C_2-equivariant Adams spectral sequence, extending the low-dimensional calculations discussed in the paper. Its status is unclear from the supplied text, so it remains open pending further verification.

Sources & referencesView supporting material

Primary source

Manyi Guo, Guchuan Li, Yunze Lu, Sihao Ma, Yuchen Wu, Zhouli Xu, Albert Jinghui Yang and Shangjie Zhang, “A Hurewicz Theorem for RO(C_2)-graded Equivariant Homology Governed by Vector Fields on Spheres”, arXiv:2605.26334 (2026).

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