Publication Date:
2013-09-18
Description:
Let A + be the ring of Laplace transforms of complex Borel measures on R with support in [0,+) which do not have a singular nonatomic part. We compare the -metric d A + for stabilizable plants over A + given in Ball & Sasane (2012, Complex Analysis and Operator Theory , 6 , 65–89). with yet another metric d H | A + , namely the one induced by the metric d H for the set of stabilizable plants over H given in Sasane (2012, Mathematical Control and Related Fields , 2 , 29–44). Both d A + and d H coincide with the classical Vinnicombe metric defined for rational transfer functions, but we show here by means of an example that these two possible extensions of the classical -metric for plants over A + do not coincide on the set of stabilizable plants over A + . We also prove that they nevertheless give rise to the same topology on stabilizable plants over A + .
Print ISSN:
0265-0754
Electronic ISSN:
1471-6887
Topics:
Mathematics
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