This preprint develops the tau-function face of derivative-order geometry and explores its connections with Painleve equations. It defines Hamiltonian derivative-order ladders and sigma-form closure relations for ladder flows. The paper derives bilinear (Hirota) transmutation formulas and extends derivative-order geometry to multitime tau ladders associated with integrable hierarchies. It also establishes exact sigma-state recovery from finite ladder windows.
Mohammad Abu-Ghuwaleh (2026) studied this question.
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