Original discrete EEI linear propagators for arbitrary 3D rotational NLS acquire a state-dependent quadratic even local-logarithm defect that blocks high-order composition; symmetrized EEI and palindromic GSH propagators restore method self-adjointness and designed orders.
arXiv preprint (2026) arXiv:2603.25282 [math.NA]
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Admissible Discrete Linear Propagators for High-Order Time Splittings of Rotational Nonlinear Schr\"odinger Equations with Arbitrary Three-Dimensional Rotation
Original discrete EEI linear propagators for arbitrary 3D rotational NLS acquire a state-dependent quadratic even local-logarithm defect that blocks high-order composition; symmetrized EEI and palindromic GSH propagators restore method self-adjointness and designed orders.