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  To compute the L-infinity norm of a proper continuous-time or
  causal discrete-time system, either standard or in the descriptor
  form,

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     G(lambda) = C*( lambda*E - A ) *B + D .

  The norm is finite if and only if the matrix pair (A,E) has no
  finite eigenvalue on the boundary of the stability domain, i.e.,
  the imaginary axis, or the unit circle, respectively.

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<A name="Specification"><B><FONT SIZE="+1">Specification</FONT></B></A>
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