In this paper we show that binormal operators have nearest normal approximants. In fact, we exhibit nearest normals to such operators and, as a corollary, show that the hermitian part of a binormal ...
Transactions of the American Mathematical Society, Vol. 302, No. 1 (Jul., 1987), pp. 371-381 (11 pages) Approximation by proximal normals to the Clarke generalized subdifferential for a distance ...