Tian-Qi Zhang

collaborators

2 papers

math.NA2026

Uniform Chebyshev asymptotics for repeated-pole rational approximation of the exponential

Fei Xue, Tianqi Zhang

We study uniform approximation of $exp (t z)$ , $t > 0$ , on $(- \infty, 0]$ by rational functions $P_{m} (z) / (q_{m} - z)^{m}$ with a prescribed repeated pole $q_{m} > 0$ . A Möbius transformation redu…

math.NA2026

Fixed-Grid Reversibility of High-Order Splittings for Nonlinear Schrödinger Equations with Arbitrary-Axis 3D Rotation

Tianqi Zhang, Fei Xue

High-order splittings for rotational nonlinear Schrödinger equations may use an exact continuous factorization of the Laplace--rotation flow, but its fixed-grid Fourier realization…