On closeness of the sum of <i>n</i> subspaces of a Hilbert space

  • I. S. Feshchenko Ин-т математики НАН Украины, Киев


We give necessary and sufficient conditions for the sum of subspaces $H_1,..., H_n,, \quad n \geq 2,$ of a Hilbert space $H$ to be a subspace and present various properties of $n$-tuples of subspaces with closed sum.
How to Cite
Feshchenko, I. S. “On Closeness of the Sum of <i>n</i&gt; Subspaces of a Hilbert Space”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 63, no. 10, Oct. 2011, pp. 1381-25, https://umj.imath.kiev.ua/index.php/umj/article/view/2814.
Research articles