The membership problem for hypergeometric sequences with rational parameters
We investigate the Membership Problem for hypergeometric sequences: given a hypergeometric sequence ❬un❭∞n=0 of rational numbers and a target t∈Q, decide whether t occurs in the sequence. We show decidability of this problem under the assumption that in the defining recurrence p(n)un = q(n)un-1, the...
| Main Authors: | , , , |
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| Format: | Conference item |
| Language: | English |
| Published: |
Association for Computing Machinery
2022
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| Summary: | We investigate the Membership Problem for hypergeometric sequences: given a hypergeometric sequence ❬un❭∞n=0 of rational numbers and a target t∈Q, decide whether t occurs in the sequence. We show decidability of this problem under the assumption that in the defining recurrence p(n)un = q(n)un-1, the roots of the polynomials p(x) and q(x) are all rational numbers. Our proof relies on bounds on the density of primes in arithmetic progressions. We also observe a relationship between the decidability of the Membership problem (and variants) and the Rohrlich-Lang conjecture in transcendence theory. |
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