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.
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DMK extended to rectangular cuboids with arbitrary periodicity via localized octree evaluations on cubical tilings and Fourier-space root-level summation with truncated kernels for reduced periodicity.
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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.
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Fast summation on rectangular cuboids with arbitrary periodicity in the DMK framework
DMK extended to rectangular cuboids with arbitrary periodicity via localized octree evaluations on cubical tilings and Fourier-space root-level summation with truncated kernels for reduced periodicity.