Mathematics – Operator Algebras
Scientific paper
2010-08-23
Sci China Math, 2011, 54(11): 2259-2274
Mathematics
Operator Algebras
24 pages. Intended for the proceedings of the conference "Operator Algebras and Related Topics". v2: added a corollary to the
Scientific paper
10.1007/s11425-011-4318-2
We show that if B is a C*-subalgebra of a C*-algebra A such that B contains a
bounded approximate identity for A, and if L is the pull-back to A of the
quotient norm on A/B, then L is strongly Leibniz. In connection with this
situation we study certain aspects of best approximation of elements of a
unital C*-algebra by elements of a unital C*-subalgebra.
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