Left invertible semigroups on Hilbert spaces . ∗
نویسنده
چکیده
For strongly continuous semigroups on a Hilbert space, we present a short proof of the fact that the left-inverse of a left-invertible semigroup can be chosen to be a semigroup as well. Furthermore, we show that this semigroup need not to be unique.
منابع مشابه
Characteristic of left invertible semigroups and admissibility of observation operators
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