Infinite Sumsets in Sets with Positive Density
Infinite Sumsets in Sets with Positive Density
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DOI:
10.1090/jams/1030
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发表时间:
2022-06
期刊:
影响因子:
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通讯作者:
Bryna Kra;Joel Moreira;F. Richter;D. Robertson
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文献类型:
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作者:
Bryna Kra;Joel Moreira;F. Richter;D. Robertson
Motivated by questions asked by Erdos, we prove that any set $A\subset{\mathbb N}$ with positive upper density contains, for any $k\in{\mathbb N}$, a sumset $B_1+\cdots+B_k$, where $B_1,\dots,B_k\subset{\mathbb N}$ are infinite. Our proof uses ergodic theory and relies on structural results for measure preserving systems. Our techniques are new, even for the previously known case of $k=2$.