本质强制形式与渐近紧半群
Essentially coercive forms and asympotically compact semigroups
AI总结:
本文研究弱于经典强制性的本质强制形式,证明其可用于构造半群生成元或自伴算子,并揭示本质正强制性导致半群渐近紧性。
摘要:
形式方法对于证明半群的生成定理最为有效,也可用于证明自伴性。迄今为止,这些定理都建立在一种强制性概念之上,该概念允许使用 Lax–Milgram 引理。本文考虑更弱的“本质”强制性版本,它们已足以获得半群 S 的生成元或一个自伴算子。我们还表明,这些性质之一,即本质正强制性,蕴含 S 的一种非常特殊的渐近行为,即渐近紧性;也就是说,当 t 趋于无穷时,dist(S(t),K(H)) 趋于 0,其中 K(H) 表示底层 Hilbert 空间上所有紧算子构成的空间。
英文摘要:
Form methods are most efficient to prove generation theorems for semigroups but also for proving selfadjointness. So far those theorems are based on a coercivity notion which allows the use of the Lax-Milgram Lemma. Here we consider weaker "essential" versions of coerciveness which already suffice to obtain the generator of a semigroup S or a selfadjoint operator. We also show that one of these properties, namely essentially positive coerciveness implies a very special asymptotic behaviour of S, namely asymptotic compactness; i.e. that dist(S(t),K(H)) tends to 0 as t tends to infinity, where K(H) denotes the space of all compact operators on the underlying Hilbert space.
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