Author

Chaohang Ma

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Preprint Sep 2026

Augmentation-Ideal Realization of Special Nottingham Congruence Series and Cartier Indecomposables

The shifted congruence series of finite special Nottingham jet groups is realized by an integral augmentation filtration. For volume-preserving formal substitutions in characteristic $p\ge5$ and $n\ge3$ variables, the filtration induced by the action on truncated power series has the congruence subgroups as its dimensi...

Chao-Hang Ma · 2 citations

Preprint Aug 2026

An Almost-Covering Threshold for Golomb-Ruler Difference Packings

For a fixed integer $t\geq 3$, consider families of $t$-mark Golomb rulers whose positive-difference sets are pairwise disjoint and contained in $[1,U]$. Let $P_t(U)$ be the largest number of integers covered by such a family. We determine the threshold for asymptotically complete coverage: \[ P_t(U)=U-o(U) \quad\Longl...

Chao-Hang Ma, Xiangjie Yi · 0 citations