Two counterexamples in semigroup theory on Hilbert space

Two counterexamples in semigroup theory on Hilbert space
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希尔伯特空间半群论的两个反例

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发表时间:
1976
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通讯作者:
P. Chernoff
P. Chernoff
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作者:
P. Chernoff

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希尔伯特空间上存在(CO)半群Ti(t)、T2(t),具有以下性质:li 具有有界生成元且一致有界,但不类似于收缩半群。 T2 是一致有界的,并且不存在使得 e` T2(t) 类似于收缩半群的标量 a。
There exist (CO) semigroups Ti(t), T2(t) on Hilbert space with the following properties: li has a bounded generator and is uniformly bounded, but is not similar to a contraction semigroup. T2 is uniformly bounded, and there exists no scalar a such that e` T2(t) is similar to a contraction semigroup.