Homenlin.SIarXiv:2605.29722

A non-commutative discrete first Painlev\'e hierarchy: the Lax pair approach

nlin.SImath-phmath.MPmath.RA2026-05v1license

Abstract

Using a non-commutative analogue of the isomonodromic problem associated with the discrete first Painlev\'e hierarchy, we construct a non-commutative version of this hierarchy, denoted by d-PImnc\text{d-PI}_m^{\text{nc}}. We show that both hierarchies, d-PIm\text{d-PI}_m and d-PImnc\text{d-PI}_m^{\text{nc}}, can be expressed in terms of the polynomials Ssk(n)S_s^k(n), which we call the Svinin polynomials. We also derive a reduction of the non-commutative Volterra lattice hierarchy to the d-PImnc\text{d-PI}_m^{\text{nc}} hierarchy and present explicit continuous limits for the first three members of the d-PImnc\text{d-PI}_m^{\text{nc}}, thereby recovering non-commutative analogues of the first three members of the differential first Painlev\'e hierarchy.

Cite

@article{arxiv.2605.29722,
  title  = {A non-commutative discrete first Painlev\'e hierarchy: the Lax pair approach},
  author = {Irina Bobrova},
  journal= {arXiv preprint arXiv:2605.29722},
  year   = {2026}
}