The norm of the sum of two projections
The norm of the sum of two projections
复制标题
两个投影之和的范数
DOI:
--
复制
发表时间:
1977
期刊:
影响因子:
--
通讯作者:
I. Vidav
中科院分区:
文献类型:
--
作者:
I. Vidav
Let A be a C*-algebra with unit 1, and let e and f be two projections of A, not both zero. J. Duncan and P. J. Taylor have shown [2, Theorem 7] that (1) lie + fil = 1 + liefIl. Their proof is geometric. It is based upon a formula of Chandler Davis [1], [3] giving a matrix representation of two projections in generic position in a Hilbert space. Here we shall give an algebraic proof of the above equality.