Faculty Publications

Simplicial Cones And The Existence Of Shape-Preserving Cyclic Operators

Document Type

Article

Keywords

Cyclic matrices, Shape-preserving operators, Simplicial cones

Journal/Book/Conference Title

Linear Algebra and Its Applications

Volume

375

Issue

1-3

First Page

157

Last Page

170

Abstract

Let X denote a real Banach space, X* its dual space and V an n-dimensional subspace of X. Given a weak*-closed cone S*⊂X*, we say that fX has shape if 〈f,φ〉≥0 for all φS*. Let S⊂X denote the cone of elements having shape. Suppose the linear operator P:V→V leaves S invariant (i.e., P(S∩V)⊂S). We seek extensions P of P to X that leave S invariant; i.e. P:X→V such that P|V = P and PS⊂S. We say that such an extension is shape-preserving. It is shown in Chalmers and Prophet [Rocky Mountain J. Math. 28 (1998) (3) 813] that, under certain conditions on S*, P = In admits a shape-preserving extension if and only if S*|V is simplicial. In this paper we characterize those operators P for which it is necessary and sufficient that S*|V be simplicial in order to admit a shape-preserving extension. This characterization involves the eigenstructure of P. © 2003 Elsevier Inc. All rights reserved.

Department

Department of Mathematics

Original Publication Date

12-1-2003

DOI of published version

10.1016/S0024-3795(03)00606-2

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