Formal identity conjecture for the stratification coefficients

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Let A0,1A_{0,1} and As,1A_{s,1} be the matrices occurring in the coefficient recursion, put

a=−A0,1β,a=\frac{-A_{0,1}}{\beta},

and let f~(T)=∑i=0∞aiTi∈Ml×l(K)[[T]]\tilde f(T)=\sum_{i=0}^{\infty}a_iT^i\in M_{l\times l}(K)[[T]] with a0=1a_0=1. For k≥1k\geq1, define aka_k inductively by

ak=1kβ(∑i+s=k\i≤k−1(di+a,s,1ai−As,1)ai).a_k=\frac{1}{k\beta}\left(\sum_{\substack{i+s=k\i\leq k-1}}(d_{i+a,s,1}a_i-A_{s,1})a_i\right).

Formal identity conjecture. One has

αaf~(αt)f~(t)=∑m≥0(∑n≥0Am,nX1[n])tm.\alpha^a\frac{\tilde f(\alpha t)}{\tilde f(t)}=\sum_{m\geq0}\left(\sum_{n\geq 0}A_{m,n}X_1^{[n]}\right)t^m.

Here αa\alpha^a is defined using the convergence property of A0,1A_{0,1}. This identity is intended to imply the cocycle condition for the associated stratification.

References

Primary source

Zeyu Liu, “De Rham prismatic crystals over O_K”, arXiv:2205.14914 (2022).

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