// 将pivot放到正确位置（j的位置）
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Платон Щукин (Редактор отдела «Экономика»)
is known to be invertible (see Appendix for a proof); therefore, this
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End-to-end validation on certified robustness, PINN residual bounds, and Lyapunov-style neural controller verification, plus mechanized theory results (including a universal approximation theorem).