title: Comment on "Analysis of the time-reversal operator for scatterers of finite size," by D. H. Chambers [J. Acoust. Soc. Am. 112, 411-419 (2002)].
abstract: This letter concerns the paper "Analysis of the time-reversal operator for scatterers of finite size" [J. Acoust. Soc. Am. 112, 411-419 (2002)]. The number of possible eigenvalues and eigenfunctions of the time reversal operator for a finite sphere given in the paper is much more than the correct number, which is proven to be the total number of multipole moments induced inside the finite sphere.
authors.affiliation: Department of Electrical and Computer Engineering, National University of Singapore, Singapore, 117576, Singapore. elechenx@nus.edu.sg
authors.forename: Xudong
authors.initials: X
authors.lastname: Chen