scholarly journals Bicomplex holomorphic functional calculus

2013 ◽  
Vol 287 (10) ◽  
pp. 1093-1105 ◽  
Author(s):  
Fabrizio Colombo ◽  
Irene Sabadini ◽  
Daniele C. Struppa
Keyword(s):  
Functional Calculus ◽  
Holomorphic Functional Calculus

scholarly journals A SHORT PROOF THAT Mn(A) IS LOCAL IF A IS LOCAL AND FRÉCHET

1992 ◽  
Vol 03 (04) ◽  
pp. 581-589 ◽  
Author(s):  
LARRY B. SCHWEITZER
Keyword(s):  
Banach Algebra ◽  
Functional Calculus ◽  
Short Proof ◽  
Complex Numbers ◽  
Holomorphic Functional Calculus ◽  
General Proof

We give a short and very general proof of the fact that the property of a dense Fréchet subalgebra of a Banach algebra being local, or closed under the holomorphic functional calculus m the Banach algebra, is preserved by tensoring with the n×n matnx algebra of the complex numbers

scholarly journals On non-holomorphic functional calculus for commuting operators

2003 ◽  
Vol 93 (1) ◽  
pp. 109 ◽  
Author(s):  
Sebastian Sandberg
Keyword(s):  
Cohomology Class ◽  
Functional Calculus ◽  
General Scheme ◽  
Holomorphic Functions ◽  
Holomorphic Functional Calculus ◽  
Resolvent Identity ◽  
Commuting Operators

We provide a general scheme to extend Taylor's holomorphic functional calculus for several commuting operators to classes of non-holomorphic functions. These classes of functions will depend on the growth of the operator valued forms that define the resolvent cohomology class. The proofs are based on a generalization of the so-called resolvent identity to several commuting operators.

The holomorphic functional calculus approach to operator semigroups

2013 ◽  
Vol 79 (1-2) ◽  
pp. 289-323
Author(s):  
Charles Batty ◽  
Markus Haase ◽  
Junaid Mubeen
Keyword(s):  
Functional Calculus ◽  
Operator Semigroups ◽  
Holomorphic Functional Calculus

scholarly journals An Introduction to Hyperholomorphic Spectral Theories and Fractional Powers of Vector Operators

2021 ◽  
Vol 31 (3) ◽  
Author(s):  
Fabrizio Colombo ◽  
Jonathan Gantner ◽  
Stefano Pinton
Keyword(s):  
Spectral Theory ◽  
Functional Calculus ◽  
Natural Extension ◽  
Several Complex Variables ◽  
Monogenic Functions ◽  
Fractional Powers ◽  
Holomorphic Functional Calculus ◽  
Slice Hyperholomorphic Functions ◽  
Hyperholomorphic Functions ◽  
Nonhomogeneous Materials

AbstractThe aim of this paper is to give an overview of the spectral theories associated with the notions of holomorphicity in dimension greater than one. A first natural extension is the theory of several complex variables whose Cauchy formula is used to define the holomorphic functional calculus for n-tuples of operators $$(A_1,\ldots ,A_n)$$ ( A 1 , … , A n ) . A second way is to consider hyperholomorphic functions of quaternionic or paravector variables. In this case, by the Fueter-Sce-Qian mapping theorem, we have two different notions of hyperholomorphic functions that are called slice hyperholomorphic functions and monogenic functions. Slice hyperholomorphic functions generate the spectral theory based on the S-spectrum while monogenic functions induce the spectral theory based on the monogenic spectrum. There is also an interesting relation between the two hyperholomorphic spectral theories via the F-functional calculus. The two hyperholomorphic spectral theories have different and complementary applications. We finally discuss how to define the fractional Fourier’s law for nonhomogeneous materials using the spectral theory on the S-spectrum.

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