Re: H-infinity poles etc.
IXP (ixp@leicester.ac.uk)
Fri, 19 Apr 1996 9:12:58 +0100 (BST)
>From: Sigurd Skogestad <Sigurd.Skogestad@kjemi.unit.no>
>Date: Thu, 18 Apr 1996 19:27:09 +0200
>To: ixp@leicester.ac.uk
>Subject: Re: H-infinity poles etc.
>
>Dear Ian,
>
>Thanks for pointing me to the page. In a revised edition we may make
>some note earlier (e.g. on p. 373) about pole-zero cancellations
>in S/T and S/KS and how it may be avoided (e.g. use SG_d with G_d=G).
>A simple reference for SISO is Kwakernaak (1993) - he refers to the
>two papers you mention.
>
>-Sigurd
>
>
Dear Sigurd
It is all much easier to see in the SISO case. We gave a presentation on the
scalar casr at the 1990 CDC. Anyway I agree that we should say more in the next
edition, which I look forward to.
Regards
Ian