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The Kadison-Singer problem for the direct sum of matrix algebras
Kadison-Singer problem direct sum of matrix algebras
2010/12/3
Let Mn denote the algebra of complex n×n matrices and write M for the direct sum of the Mn. So a typical element of M has the form x = x1 ⊕ x2 · · · ⊕ xn ⊕ · · · ,where xn ∈ Mn and kxk = supn kxnk. We...