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On the density of stabilizable plants in the class of unstabilizable plants: The real symmetric disk algebra case |
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| Authors: | Rudolf Rupp |
| Institution: | a Fakultät Allgemeinwissenschaften, Georg-Simon-Ohm-Hochschule Nürnberg, Keßlerplatz 12, D-90489 Nürnberg, Germany b Mathematics Department, London School of Economics, Houghton Street, London WC2A 2AE, UK |
| Abstract: | Let AR denote the set of functions from the disk algebra having real Fourier coefficients. Generalizing a result of Quadrat we show that every unstabilizable multi-input multi-output plant is as close as we want to a stabilizable multi-input multi-output plant in the product topology. |
| Keywords: | primary 46J15 secondary 19B10 30H05 93D15 |
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