On Pre-Hilbert Noncommutative Jordan Algebras Satisfying ∥x2∥=∥x∥2
Joint Authors
Moutassim, Abdelhadi
Benslimane, Mohamed
Source
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-08-23
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
Let A be a real or complex algebra.
Assuming that a vector space A is endowed with a pre-Hilbert norm ∥·∥ satisfying ∥x2∥=∥x∥2 for all x∈A.
We prove that A is finite dimensional in the following cases.
(1) A is a real weakly alternative algebra without divisors of zero.
(2) A is a complex powers associative algebra.
(3) A is a complex flexible algebraic algebra.
(4) A is a complex Jordan algebra.
In the first case A is isomorphic to ℝ,ℂ,ℍ, or ?, and A is isomorphic to ℂ in the last three cases.
These last cases permit us to show that if A is a complex pre-Hilbert noncommutative Jordan algebra satisfying ∥x2∥=∥x∥2 for all x∈A, then A is finite dimensional and is isomorphic to ℂ.
Moreover, we give an example of an infinite-dimensional real pre-Hilbert Jordan algebra with divisors of zero and satisfying ∥x2∥=∥x∥2 for all x∈A.
American Psychological Association (APA)
Benslimane, Mohamed& Moutassim, Abdelhadi. 2012. On Pre-Hilbert Noncommutative Jordan Algebras Satisfying ∥x2∥=∥x∥2. ISRN Algebra،Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-463953
Modern Language Association (MLA)
Benslimane, Mohamed& Moutassim, Abdelhadi. On Pre-Hilbert Noncommutative Jordan Algebras Satisfying ∥x2∥=∥x∥2. ISRN Algebra No. 2012 (2012), pp.1-11.
https://search.emarefa.net/detail/BIM-463953
American Medical Association (AMA)
Benslimane, Mohamed& Moutassim, Abdelhadi. On Pre-Hilbert Noncommutative Jordan Algebras Satisfying ∥x2∥=∥x∥2. ISRN Algebra. 2012. Vol. 2012, no. 2012, pp.1-11.
https://search.emarefa.net/detail/BIM-463953
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-463953