On a new condition implying that an achievement set is a Cantorval and its applications
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866914210757214208 |
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| author | Nowakowski, Piotr |
| author_facet | Nowakowski, Piotr |
| contents | Given a nonincreasing sequence of positive numbers $(a_n)$ such that the series $\sum a_n$ is convergent, by $E(a_n)$ we denote the set of all subsums of the series $\sum a_n$ and call it the achievement set of $(a_n)$. It is well known that such a set can be a finite union of closed intervals, a Cantor set or a Cantorval. We give a new condition implying that the last possibility occurs. We also show how we can use this condition to produce new achievable Cantorvals. In particular, we prove that Kakeya conditions cannot tell us more about the form of the achievement set than it was proved by Kakeya. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_17761 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On a new condition implying that an achievement set is a Cantorval and its applications Nowakowski, Piotr Classical Analysis and ODEs 11B05, 11B99, 26D15 Given a nonincreasing sequence of positive numbers $(a_n)$ such that the series $\sum a_n$ is convergent, by $E(a_n)$ we denote the set of all subsums of the series $\sum a_n$ and call it the achievement set of $(a_n)$. It is well known that such a set can be a finite union of closed intervals, a Cantor set or a Cantorval. We give a new condition implying that the last possibility occurs. We also show how we can use this condition to produce new achievable Cantorvals. In particular, we prove that Kakeya conditions cannot tell us more about the form of the achievement set than it was proved by Kakeya. |
| title | On a new condition implying that an achievement set is a Cantorval and its applications |
| topic | Classical Analysis and ODEs 11B05, 11B99, 26D15 |
| url | https://arxiv.org/abs/2512.17761 |