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Studia Mathematica

2008 | 187 | 3 | 199-218

Convergence at the origin of integrated semigroups

EN

Abstrakty

EN
We study a classification of κ-times integrated semigroups (for κ > 0) by their (uniform) rate of convergence at the origin: $||S(t)|| = 𝒪(t^{α})$ as t → 0 (0 ≤ α ≤ κ). By an improved generation theorem we characterize this behaviour by Hille-Yosida type estimates. Then we consider integrated semigroups with holomorphic extension and characterize their convergence at the origin, as well as the existence of boundary values, by estimates of the associated holomorphic semigroup. Various examples illustrate these results. The particular case α = κ, which corresponds to the notions of Riesz means or tempered integrated semigroups, is of special interest; as an application, it leads to an integrated version of Euler's exponential formula.

199-218

wydano
2008

Twórcy

autor
• Department of Theoretical Physics, University of Geneva, quai Ernest-Ansermet 24, CH-1211 Genève 4, Switzerland