Generalizes the moment of a subspace to characterize B-minimality of Hermitian matrices via joint numerical range and subdifferentials of the maximum eigenvalue.
Mata-Lorenzo, and L´ azaro Recht
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Best approximants relative to a C$^*$-subalgebra, joint numerical range and subdifferentials
Generalizes the moment of a subspace to characterize B-minimality of Hermitian matrices via joint numerical range and subdifferentials of the maximum eigenvalue.