Recent publications

Specral isometries of operator algebras, (with M. Mathieu),
Archiv der Mathematik, 2004 pdf
Linear maps on matrix algebra that preserve the numerical range, numerical radius or the states (with C. K. Li),
Cnd. J. Math. 56, (2004), 134 - 167. pdf
Isometries of block triangular matrix algebras with respect to Ky-Fan norms, (with C. K. Li and P. Semrl),
Archiv der Mathematik, to appear. 81, (2003), 175 - 181. pdf
The semigroup generated by a similarity orbit or a unitary orbit of an operator, (with C.K. Fong)
Proc. Amer. Math. Soc., 131 (2003), 3203 -- 3210. pdf
Conjugation-invariant subspaces and Lie ideals in non-selfadjoint opeartor algebras, (with L. W. Marcoux)
J. London Math. Soc. (2) 65(2002), 493-512. pdf
Three linear preserver problems, Mathematics and the 21st century 211-221, World Sci. Publ. 2001. pdf
Semigroups generated by similarity orbits (with L. Grunenfelder, M. Omladic and H. Radjavi)

Semigroup Forum,

Inequalities for products of spectral radii (with M. Omladic, H. Radjavi and P. Rosenthal)

Proc. Amer. Math. Soc.,

129

Additive rank-one preserving mappings on triangular matrix algebras (with J. Bell)

Lin. Alg. Appl.

312

pdf

Lie isomorphisms of nest algebras, (with L. W. Marcoux),
J. Funct. Anal., 164 (1999), 163-180. pdf
Maps on matrices that preserve the spectral radius distance, (with R. Bhatia and P. Semrl),
Studia Math. 134 (1999), 99-110.
Commutativity preserving linear maps and Lie automorphisms of triangular matrix algebras (with L. W. Marcoux),
Lin. Alg. Appl. 288 (1999), 89-104 pdf
A copy of this paper is available from Lin. Alg. Appl. Click here Then go to the February 1999 issue.
Lie ideals in triangular operator algebras (with T. D. Hudson and L. W. Marcoux),
Trans. Amer. Math. Soc. 350 (1998), 3321-3339. pdf
A copy of this paper is available from the American Mathematical Society.&nb sp; Click here.
Invertivility preserving linear maps on L(X), Trans. Amer. Math. Soc. 350 (1998), 3321-3339.
A copy of this paper is available from the American Mathematical Society. Click here.
Simultaneous triangularizability, near commutativity and Rota's theorem (with A. A. Jafarian, H. Radjavi and P. Rosenthal)
Trans. Amer. Math. Soc. 347 (1995), no. 6, 2191--2199.
Spectral properties of the the operator equation AX+XB=C (with W. Arendt and F. Räbiger)

Quart. J. Math. Oxford Ser. (2)