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Abstract
A linear subspace
B
of
L ( H ) has the property
P 1 if every element
of its predual
B ∗
has the form
x
+ B ⊥
with
r a n k ( x )
≤ 1 . We prove
that if
dim H
≤ 4 and
B is a unital operator
subalgebra of
L ( H ) which
has the property
P 1 , then
dim B
≤ dim H . We consider whether
this is true for arbitrary
H .
Keywords
property $\mathrm P_1$, 2-reflexive
Mathematical Subject Classification 2000
Primary: 47L05, 47L75
Secondary: 47A15
Milestones
Received: 28 February 2010
Revised: 14 June 2011
Accepted: 16 June 2011
Published: 13 March 2012
Communicated by Charles R. Johnson