Author

Yi-Fan Jing

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Preprint Sep 2026

Geometric lifting and Freiman's $3k-4$ theorem in compact connected abelian groups

We develop a geometric lifting method for inverse sumset problems in compact connected abelian groups. The first result is an analogue of Freiman's $3k-4$ theorem, that is every compact set $A\subseteq G$ of sufficiently small Haar measure satisfying $\mu_G(A+A)<3\mu_G(A)$ is contained in a one dimensional Bohr set of...

Yi-Fan Jing, Yu-Chen Meng · 0 citations

Preprint Aug 2026

Near diagonal additive energy bound for points on algebraic surfaces

Let $F:\mathbb{R}^3\to\mathbb{R}$ be a polynomial that is irreducible over $\mathbb{R}$ with $\text{deg} F\geq2$. We prove that, for any finite $X\subset Z(F)$ that does not concentrate on affine lines, \[ E(X)=\#\{(a,b,c,d)\in X^4: a+b=c+d\}\ll_{\text{deg} F,\,\epsilon}(\# X)^{2+\epsilon}. \] In particular, this answe...

Yi-Fan Jing, Shukun Wu · 1 citation