Mathematical Control Theory of Coupled PDEs John C. Yoder He notes that certain dualities

He notes that certain dualities recur in the literature on this subject

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While she keeps her son her illegitimate daughter Helene is raised by the state and later ‘adopted’ by her aunt so as to be allowed to marry Hans an affluent Prussian industrialist

Mathematical Control Theory of Coupled PDEs John C. Yoder He notes that certain dualitiesAlthough mathematical control theory for a single partial differential equation (PDE) has dominated the research literature for quite a while, new, complex, and challenging issues have recently arisen in the context of coupled, or interconnected, PDE systems. This has led to a rapidly growing interest, and many unanswered questions, within the PDE community. By concentrating on systems of hyperbolic and parabolic coupled PDEs that are nonlinear, this