Publications de l'Institut Mathématique, Nouvelle Série Vol. 83(97), pp. 15–25 (2008) 

COMPLEX POWERS OF OPERATORSMarko KosticFaculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, SerbiaAbstract: We define the complex powers of a densely defined operator $A$ whose resolvent exists in a suitable region of the complex plane. Generally, this region is strictly contained in an angle and there exists $\alpha\in[0,\infty)$ such that the resolvent of $A$ is bounded by $O((1+\lambda)^\alpha)$ there. We prove that for some particular choices of a fractional number $b$, the negative of the fractional power $(A)^b$ is the c.i.g. of an analytic semigroup of growth order $r>0$. Classification (MSC2000): 47A99; 47D03; 47D09; 47D62 Full text of the article: (for faster download, first choose a mirror)
Electronic fulltext finalized on: 21 Oct 2008. This page was last modified: 10 Dec 2008.
© 2008 Mathematical Institute of the Serbian Academy of Science and Arts
