Commuting Subnormal Operators Quasisimilar to Multiplication by Coordinate Functions on ODD Spheres

1982 ◽  
pp. 81-88
Author(s):  
J. Janas
Keyword(s):  
Subnormal Operators ◽  
Coordinate Functions

scholarly journals Variational Methods for Glacier Mechanics Problems

1981 ◽  
Vol 27 (95) ◽  
pp. 19-24 ◽  
Author(s):  
Robert G. Oakberg
Keyword(s):  
Finite Element ◽  
Melting Point ◽  
Variational Principle ◽  
Finite Element Model ◽  
Related Problem ◽  
Cylindrical Channel ◽  
Direct Methods ◽  
Approximate Solutions ◽  
Element Model ◽  
Coordinate Functions

AbstractThe object of the research is to determine whether direct methods from the calculus of variations can provide convenient approximate solutions of complex problems in glacier mechanics. The Ritz technique is used to minimize an appropriate functional. Coordinate functions obtained from a finite-element model are combined with a coordinate function that is the solution of a related problem. The finite-element coordinate functions make localized adjustments to the related solution. Solutions of two sample problems are presented. An analysis of the closure of an intergranular vein in ice at the melting point is based upon a variational principle for velocities. An analysis of the flow of ice in a cylindrical channel is based upon a variational principle for stresses.

scholarly journals Complete hypersurfaces in cylinders

1989 ◽  
Vol 46 (2) ◽  
pp. 313-318
Author(s):  
Thomas Hasanis
Keyword(s):  
Euclidean Space ◽  
Scalar Curvature ◽  
Sectional Curvature ◽  
Positive Scalar Curvature ◽  
Positive Scalar ◽  
Coordinate Functions ◽  
Bounded Below ◽  
Complete Hypersurfaces

AbstractWe consider the extent of certain complete hypersurfaces of Euclidean space. We prove that every complete hypersurface in En+1 with sectional curvature bounded below and non-positive scalar curvature has at least (n − 1) unbounded coordinate functions.

scholarly journals The Berger-Shaw theorem for cyclic subnormal operators

1997 ◽  
Vol 46 (3) ◽  
pp. 0-0 ◽  
Author(s):  
Nathan S. Feldman
Keyword(s):  
Subnormal Operators

Subnormal Operators

1989 ◽  
pp. 15-40
Author(s):  
Mircea Martin ◽  
Mihai Putinar
Keyword(s):  
Subnormal Operators

scholarly journals Extensions of the Fuglede-Putnam-type theorems to subnormal operators

1985 ◽  
Vol 31 (2) ◽  
pp. 161-169 ◽  
Author(s):  
Takayuki Furuta
Keyword(s):  
Type Theorem ◽  
Degree Of Approximation ◽  
Subnormal Operators ◽  
Normal Operators

At first we investigate the similarity between the Kleinecke-Shirokov theorem for subnormal operators and the Fuglede-Putnam theorem and also we show an asymptotic version of this similarity. These results generalize results of Ackermans, van Eijndhoven and Martens. Also we show two theorems on degree of approximation on subnormal derivation ranges. These results generalize results of Stampfli on degree of approximation on normal derivation ranges. The purpose of this paper is to show that the Fuglede-Putnam-type theorem on normal operators can certainly be generalized to subnormal operators.

scholarly journals A functional calculus for subnormal operators

1976 ◽  
Vol 82 (2) ◽  
pp. 259-262
Author(s):  
John B. Conway ◽  
Robert F. Olin
Keyword(s):  
Functional Calculus ◽  
Subnormal Operators

scholarly journals A class of pure subnormal operators.

1977 ◽  
Vol 24 (1) ◽  
pp. 115-118
Author(s):  
Robert F. Olin
Keyword(s):  
Subnormal Operators
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