Overdetermined Multidimensional Systems: State Space and Frequency Domain Methods

  • Joseph A. Ball
  • Victor Vinnikov
Part of the The IMA Volumes in Mathematics and its Applications book series (IMA, volume 134)


We consider 2D input-state-output linear systems where the evolution of the whole state is specified in two independent directions. The requirement that the value of the state at a given point be independent of the path from the origin chosen to arrive at the given point leads to nontrivial consistency conditions: the transient evolutions (i.e., state evolution with zero inputs) should commute, and the input signal (and then also the output signal) should solve a compatibility partial differential equation. We show that many of the standard structural properties (e.g., controllability, observability, minimality, pairing with adjoint system, feedback coupling, equivalence between conservative systems and Lax-Phillips scattering theory) and standard problems (e.g., pole placement, linear-quadratic-regulator problem, H -control problems) for ID linear systems carry over for this setting. There is also a frequency-domain theory for this class of systems: the transfer function is a bundle map between flat vector bundles on a compact Riemann surface, or equivalently, between kernel bundles for determinantal representations of an algebraic curve C embedded in ℂ2 (or rather in the projective plane ℙ 2 ). The transform from the time domain to the frequency domain is implemented by a “Laplace transform along the curve C”. Just as optimal control for continuous-time systems leads to control-theoretic interpretations for Hardy-space function theory on the right half plane, control theory for this class of overdetermined systems leads to control-theoretic interpretations for function theory on a finite bordered Riemann surface. We expect such a mathematically rich theory to have use in control applications yet to be discovered as well as applications beyond the scope of traditional system theory; we mention two such possibilities of the latter type: wave-particle duality in quantum mechanics and a mathematical model for DNA chains.


Vector Bundle Riemann Surface Compact Riemann Surface Frequency Domain Analysis Adjoint System 
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Copyright information

© Springer-Verlag New York, Inc. 2003

Authors and Affiliations

  • Joseph A. Ball
    • 1
  • Victor Vinnikov
    • 2
  1. 1.Department of MathematicsVirginia TechBlacksburgUSA
  2. 2.Department of MathematicsBen Gurion University of the NegevBeer-ShevaIsrael

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