A note on the unitary part of a contraction
Linear Algebra and Its Applications
Short and independent proofs are given to two recent results of Gau and Wu on the unitary part of a contraction. (C) 2010 Elsevier Inc. All rights reserved.
Li, Chi-Kwong, A note on the unitary part of a contraction (2010). Linear Algebra and Its Applications, 433(10-Aug), 1533-1535.