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On positive linear maps preserving invertibility

✍ Scribed by M-D. Choi; D. Hadwin; E. Nordgren; H. Radjavi; P. Rosenthal


Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
423 KB
Volume
59
Category
Article
ISSN
0022-1236

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Let A be a unital matrix algebra, Ο• : A β†’ M n (C) a unital linear mapping and B the algebra generated by Ο•(A). The mapping Ο• is a homomorphism modulo the Jacobson radical in B if and only if for k = dim(B)dim(Ο•(A)) + 3 the mapping Ο• βŠ— id : A βŠ— M k (C) β†’ B βŠ— M k (C) preserves invertibility. This resu

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Suppose m is an n X 12 (n 2 2) matrix algebra over a C\*-algebra g, and Q? is a C\*-algebra. If p : i?X + '23 is a positive, disjoint linear map, then p preserves absolute values. In particular, for a linear map rp : '?I + '$3 of P-algebras, p preserves absolute values if and only if it is positive