کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4620231 | 1339457 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the injective norm and characterization of some subclasses of normal operators by inequalities or equalities
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
آنالیز ریاضی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the injective norm and characterization of some subclasses of normal operators by inequalities or equalities On the injective norm and characterization of some subclasses of normal operators by inequalities or equalities](/preview/png/4620231.png)
چکیده انگلیسی
Let B(H)B(H) be the C*C*-algebra of all bounded linear operators acting on a complex Hilbert space H. In this note, we shall show that if S is an invertible normal operator in B(H)B(H) the following estimation holds‖S⊗S−1+S−1⊗S‖λ⩽‖S‖‖S−1‖+1‖S‖‖S−1‖ where ‖.‖λ‖.‖λ is the injective norm on the tensor product B(H)⊗B(H)B(H)⊗B(H). This last inequality becomes an equality when S is invertible self-adjoint. On the other hand, we shall characterize the set of all invertible normal operators S in B(H)B(H) satisfying the relation‖S⊗S−1+S−1⊗S‖λ=‖S‖‖S−1‖+1‖S‖‖S−1‖ and also we shall give some characterizations of some subclasses of normal operators in B(H)B(H) by inequalities or equalities.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Mathematical Analysis and Applications - Volume 351, Issue 1, 1 March 2009, Pages 277–284
Journal: Journal of Mathematical Analysis and Applications - Volume 351, Issue 1, 1 March 2009, Pages 277–284
نویسندگان
Ameur Seddik,