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- Edward Poon, Paul F. Lachiewicz
- The Journal of arthroplasty
- 1998

Controversy exists over whether to remove a well-fixed femoral component at the time of revision of a failed acetabular component, and it has been suggested that the femoral component be removed andâ€¦ (More)

- Paul F. Lachiewicz, Edward Poon
- The Journal of bone and joint surgery. Americanâ€¦
- 1998

Fifty-seven revision total hip arthroplasties in fifty-six patients were performed with a Harris-Galante porous-coated acetabular component by one surgeon, and the patients were followedâ€¦ (More)

- Edward Poon
- 2008

Let â€– Â· â€– be a unitary similarity invariant norm on the set Mn of nÃ— n complex matrices. A description is obtained for surjective maps Ï† on Mn satisfying â€–ABâˆ’ BAâ€– = â€–Ï†(A)Ï†(B)âˆ’Ï†(B)Ï†(A)â€– for all A,B âˆˆâ€¦ (More)

- LI CHI-KWONG, Edward Poon, ASHWIN RASTOGI
- 1984

Characterizations are obtained for Schur (Hadamard) multiplicative maps on complex matrices preserving the spectral radius, numerical radius, or spectral norm. Similar results are obtained for mapsâ€¦ (More)

- Edward Poon
- 2013

The linear structure of the real space spanned by maximally entangled states is investigated, and used to completely characterize those linear maps preserving the set of maximally entangled states onâ€¦ (More)

local operations H. F. Chau, Chi-Hang Fred Fung, Chi-Kwong Li, Edward Poon, and Nung-Sing Sze Department of Physics and Center of Computational and Theoretical Physics, University of Hong Kong,â€¦ (More)

- Chi-Kwong Li, Edward Poon
- 2012

Denote the joint numerical radius of an m-tuple of bounded operators A = (A1, . . . , Am) by w(A). We give a complete description of maps f satisfying w(A âˆ’ B) = w(f(A) âˆ’ f(B)) for any two m-tuplesâ€¦ (More)

- Chi-Kwong Li, Edward Poon
- 2005

Let F (A) be the numerical range or the numerical radius of a square matrix A. Denote by Aâ—¦B the Schur product of two matrices A and B. Characterizations are given for mappings on square matricesâ€¦ (More)

It is shown that two induced norms are the same if and only if the corresponding norm numerical ranges or radii are the same, which in turn is equivalent to the vector states and mixed states arisingâ€¦ (More)

Given two sets of quantum states {A1, . . . , Ak} and {B1, . . . , Bk}, represented as sets as density matrices, necessary and sufficient conditions are obtained for the existence of a physicalâ€¦ (More)

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