English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

For $\delta>0$ sufficiently small and $A\subset \mathbb{Z}^k$ with $|A+A|\le(2^k+\delta)|A|$, we show either $A$ is covered by $m_k(\delta)$ parallelhyperplanes, or satisfies $|\widehat{\operatorname{co}}(A)\setminus A|\lec_k\delta |A|$, where $\widehat{\operatorname{co}}(A)$ is the smallest convexprogression (convex set intersected with a sublattice) containing $A$. Thisgeneralizes the Freiman-Bilu $2^k$ theorem, Freiman's $3|A|-4$ theorem, andrecent sharp stability results of the present authors for sumsets in$\mathbb{R}^k$ conjectured by Figalli and Jerison.

Sets in $\mathbb{Z}^k$ with doubling $2^k+\delta$ are near convex progressions