English

Irreducibility of extensions of Laguerre Polynomials

Number Theory 2019-01-07 v1

Abstract

For integers a0,a1,,ana_0,a_1,\ldots,a_n with a0an=1|a_0a_n|=1 and either α=u\alpha =u with 1u501\leq u \leq 50 or α=u+12\alpha=u+ \frac{1}{2} with 1u451 \leq u \leq 45, we prove that ψn(α)(x;a0,a1,,an)\psi_n^{(\alpha)}(x;a_0,a_1,\cdots,a_n) is irreducible except for an explicit finite set of pairs (u,n)(u,n). Furthermore all the exceptions other than n=212,α=89/2n=2^{12},\alpha=89/2 are necessary. The above result with 0α100\leq\alpha \leq 10 is due to Filaseta, Finch and Leidy and with α{1/2,1/2}\alpha \in \{-1/2,1/2\} due to Schur.

Keywords

Cite

@article{arxiv.1901.01072,
  title  = {Irreducibility of extensions of Laguerre Polynomials},
  author = {Shanta Laishram and Saranya G. Nair and Tarlok Nath Shorey},
  journal= {arXiv preprint arXiv:1901.01072},
  year   = {2019}
}